SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
1
SP9501
12Bit, Voltage Output D/A Converter
s
Low Power 16mW
s
Voltage Output,
4.5V range
s
Midscale Preset, Zero Volts Out
s
2MHz Multiplying Bandwidth
(4-Quadrant)
s
Standard 3-Wire Serial Interface
s
8pin (0.15") SOIC and Plastic DIP
Packages
s
5V supply operation
DESCRIPTION...
The SP9501 is a low power 12-Bit Digital-to-Analog Converter. It features
4.5V output swings
when using
5 volt supplies. The converter uses a standard 3wire serial interface compatible
with SPI
TM
, QSPI
TM
and Microwire
TM
. The output settling-time is specified at 4
s. The SP9501 is
available in 8pin 0.15" SOIC and DIP packages, specified over commercial and industrial
temperature ranges.
DAC
LATCH
Ref In
+
V
OUT
CS
SDI
SCK
SHIFT
REGISTER
DAC
REGISTER
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device
at these or any other above those indicated in the operation
sections of the specifications below is not implied. Exposure to
absolute maximum rating conditions for extended periods of time
may affect reliability.
V
DD
- GND ..................................................................... -0.3V,+6.0V
V
SS
- GND .................................................................... +0.3V, -6.0V
V
DD
- V
SS
......................................................................................................................
-0.3V, +12.0V
V
REF
..................................................................................... V
SS
, V
DD
D
IN
....................................................................................... V
SS
, V
DD
Power Dissipation
Plastic DIP .......................................................................... 375mW
(derate 7mW/
C above +70
C)
Plastic LCC ......................................................................... 375mW
(derate 7mW/C above +70C)
Small Outline ...................................................................... 375mW
(derate 7mW/C above +70C)
SPECIFICATIONS
(Typical at 25C; T
MIN
T
A
T
MAX
; V
DD
= +5V, V
SS
= 5V, V
REF
= +3V; CMOS logic level digital inputs; specifications apply to all grades unless otherwise noted.)
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
DIGITAL INPUTS
Logic Levels
V
IH
2.4
Volts
V
IL
0.8
Volts
4 Quad, Bipolar Coding
Offset Binary
REFERENCE INPUT
Voltage Range
3
4.5
Volts
Note 5
Input Resistance
6
8.8
k
D
IN
= 1,877; code dependent
ANALOG OUTPUT
Gain
B, K
0.5
2.0
LSB
V
REF
=
3V; Note 3
A, J
1.0
4.0
LSB
V
REF
=
3V; Note 3
1.0
5.0
LSB
V
REF
=
4.5V; Note 3
Initial Offset Bipolar
0.25
3.0
LSB
D
IN
= 2,048
Voltage Range Bipolar
3.0
4.5
Volts
Output Current
5.0
mA
V
REF
=
3V
0.5
mA
V
REF
=
4.5V
STATIC PERFORMANCE
Resolution
12
Bits
Integral Linearity
B, K
0.25
0.5
LSB
V
REF
=
3V; Note 3
A, J
0.5
1.0
LSB
V
REF
=
3V; Note 3
0.5
3.0
LSB
V
REF
=
4.5V; Note 3
Differential Linearity
B, K
0.25
0.75
LSB
A, J
0.25
1.0
LSB
Monotonicity
Guaranteed
DYNAMIC PERFORMANCE
Settling Time
Small Signal
0.5
s
to 0.012%
Full Scale
4
s
to 0.012%
Slew Rate
4
V/
s
Multiplying Bandwidth
2
MHz
STABILITY
Gain
15
ppm/C
t
MIN
to t
MAX
Bipolar Zero
15
ppm/C
t
MIN
to t
MAX
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
3
SPECIFICATIONS (continued)
(Typical at 25C; T
MIN
T
A
T
MAX
; V
DD
= +5V, V
SS
= 5V, V
REF
= +3V; CMOS logic level digital inputs; specifications apply to all grades unless otherwise noted.)
PARAMETER
MIN.
TYP.
MAX.
UNITS
CONDITIONS
POWER REQUIREMENTS
Note 5
V
DD
+5V,
3%; Note 4, 5
J, K
1.6
2.3
mA
A, B
1.6
2.9
mA
V
SS
-5V,
3%; Note 4, 5
J, K
1.6
2.3
mA
A, B
1.6
2.9
mA
Power Dissipation
16
mW
SWITCHING
CHARACTERISTICS
CS Setup Time
(t
CSS
)
25
ns
SCLK Fall to CS Fall
Hold Time
(t
CSH0
)
20
ns
SCLK Fall to CS Rise
Hold Time
(t
CSH1
)
0
ns
SCLK High Width
(t
CH
)
40
ns
SCLK Low Width
(t
CL
)
40
ns
DIN Setup Time
(t
DS
)
50
ns
DIN Hold Time
(t
DH
)
0
ns
CS High Pulse Width
(t
CSW
)
30
ns
ENVIRONMENTAL AND
MECHANICAL
Operating Temperature
J, K
0
+70
C
A, B
40
+85
C
Storage
60
+150
C
Package
_N
8-pin Plastic DIP
_S
8-pin 0.15" SOIC
Notes:
1.
Integral Linearity, for the SP9501, is measured as the arithmetic mean value of the magnitudes of the
greatest positive deviation and the greatest negative deviation from the theoretical value for any given
input condition.
2.
Differential Linearity is the deviation of an output step from the theoretical value of 1 LSB for any two
adjacent digital input codes.
3.
1 LSB = 2*V
REF
/4,096.
4.
V
REF
= 0V.
5.
The following power up sequence is recommended: V
SS
(-5V), Vdd (+5V), V
REF
.
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
4
THEORY OF OPERATION
The SP9501 consists of four main functional
blocks the input shift register, DAC register,
12-Bit D/A converter and a bipolar output volt-
age amplifier, Figure 1.
The input shift register is used to convert the
serial input data stream to a parallel 12Bit
digital word. The input data is shifted on posi-
tive clock (SCLK) edges when the Chip Select
(CS) signal is in the "low" state. The MSB is
loaded first and LSB last. No shifting of the
input data occurs when the Chip Select (CS)
signal is in the "high" state.
The DAC register is used to store the digital
word which is sent to the DAC. Its value is
updated on the positive transition of the Chip
Select (CS) signal.
In order to reduce the DAC full scale output
sensitivity to the large weighting of the MSB's
found in conventional R-2R resistor ladders, the
3 MSB's are decoded into 8 equally weighted
levels. This reduces the contribution of each bit
by a factor of 4, thus, reducing the output sensi-
tivity to mismatches in resistors and switches by
the same amount. Linearity errors and stability
are both improved for the same reasons.
The DAC itself is implemented with precision
thin-film resistors and CMOS transmission gate
switches. The resistor network is laser-trimmed
to achieve better than 12Bit accuracy. The D/
A converter is used to convert the 12-bit input
word to a precision voltage.
Table 1. Offset Binary Coding
2 V
REF
2
12
INPUT
OUTPUT
MSB
LSB
1111
1111
1111
V
REF
- 1 LSB
1111
1111
1110
V
REF
- 2 LSB
1000
0000
0001
0 + 1 LSB
1000
0000
0000
0
0000
0000
0001
-V
REF
+ 1 LSB
0000
0000
0000
-V
REF
1 LSB =
FEATURES...
The SP9501 is a low power 12Bit Digital-to-
Analog Converter. The converter features
4.5V
output swings with
5V supplies. The input
coding format used is standard offset binary,
Table 1.
This Digital-to Analog Converter uses a stan-
dard 3wire interface compatible with SPI
TM
,
QSPI
TM
and Microwire
TM
. The output settling
time is specified at 4
s to full 12-bit accuracy
when driving a 5K
, 50pF load combination.
The SP9501 Digital-to-Analog Converter is
ideally suited for applications such as ATE,
process controllers, robotics and instrumenta-
tion. The SP9501 is available in an 8-pin 0.15"
SOIC and 0.3" PDIP packages, specified over
commercial and industrial temperature ranges.
V
OUT
1
2
3
4
8
7
6
5
V
DD
D
IN
V
REF
V
SS
CS
GND
SCLK
SP9501
PINOUT 8-PIN PLSTIC DIP & SOIC
PIN ASSIGNMENTS
Pin 1- V
OUT
- Voltage Output.
Pin 2- V
DD
- +5V Power Supply Input.
Pin 3- SCLK - Serial Clock Input.
Pin 4- D
IN
- Serial Data Input.
Pin 5- CS - Chip Select Input.
Pin 6 - V
SS
- 5V Power Supply Input.
Pin 7- GND - Ground.
Pin 8- V
REF
- Reference Input.
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
5
V
OUT
V
REF
DAC
16
7
9
3 TO 7
DECODE
3
9
LATCH
12
1
SHIFT
REGISTER
D
IN
+
Figure 1. Detailed Block Diagram
The operational amplifier is a rail-to-rail input,
rail-to-rail output CMOS amplifier. It is capable
of supplying 5mA of load current in the
3 volt
output range. The initial offset voltage is laser-
trimmed to improve accuracy. Settling time is
4
s for a full scale output transition to 0.012%
accuracy.
The bipolar voltage output of the SP9501 is
created on chip from the DAC output voltage
(V
DAC
) by using an operational amplifier and
two feedback resistors connected as shown in
Figure 2. This configuration produces a
4.5V
bipolar output range with standard offset binary
coding, Table 1.
USING THE SP9501
External Reference
The DAC input resistance is code dependent
and is minimum at code 1877 and nearly infinite
at code 0. Because of the code-dependent nature
of the reference a high quality, low output im-
pedance amplifier should be used to drive
the V
REF
input.
Serial Clock and Update Rate
The SP9501 maximum serial clock rate (SCLK)
is given by 1/(t
CH
+t
CL
) which is approximately
12.5 MHz. The digital word update rate is lim-
ited by the chip select period, which is 12 X
SCLK periods plus the CS high pulse width t
CSW
.
This is equal to a 1
s or 1 MHz update rate.
However, the DAC settling time to 12Bits is 4
s, which for full scale output transitions would
limit the update rate to 250 kHz.
Logic Interface
The SP9501 is designed to be compatible with
TTL and CMOS logic levels. However, driving
the digital inputs with TTL level signals will
increase the power consumption of the part by
300
A. In order to achieve the lowest power
consumption use rail-to-rail CMOS levels to
drive the digital inputs.
Midscale Preset
By holding CS pin low during Power-up, the
DAC output can be forced to 0V. Following
Power-up, the CS pin should be kept low as the
first digital word is shifted into the shift register.
When CS pin is set high, the digital word in the
shift register (loaded by the last 12 clock cycles)
is latched into the DAC register. Thus, the DAC
can be forced to go from midscale (1000 0000
0000, on Power-up) to any digital state, without
entering an unknown state.
+
D
IN
V
REF
V
OUT
V
DAC
V
OUT
V
DAC
D
IN
x V
REF
D
IN
WHERE
=
=
2048
4096
x V
REF
1
(
)
(
)
Figure 2. Transfer Function
DAC
REGISTER
40K
40K
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
6
t
CSW
t
CSH1
t
CSS
t
CL
t
CH
t
CSHO
t
DS
t
DH
CS
SCLK
DIN
DB11
DB10
DB9
DB8
DB0
1
2
3
4
12
Figure 3. Timing Diagram
SCLK
DIN
CS
SK
SO
I/O
SI
N/C
SP9501
MICROWIRE
PORT
Figure 4. Microwire Connection
SCLK
DIN
CS
SK
SO
I/O
SI
N/C
SP9501
SPI
PORT
CPOL = 0, CPHA = 0
Figure 5. SPI Connection
0
CODE
4095
+0.25 lsb
DNLE
-0.25 lsb
+0.25 lsb
INLE
-0.25 lsb
DNLE, INLE Plots
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
7
D
ALTERNATE
END PINS
(BOTH ENDS)
D1 = 0.005" min.
(0.127 min.)
E
PACKAGE: PLASTIC
DUALINLINE
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
A = 0.210" max.
(5.334 max).
E1
C
L
A2
A1 = 0.015" min.
(0.381min.)
B
B1
e = 0.100 BSC
(2.540 BSC)
e
A
= 0.300 BSC
(7.620 BSC)
A2
B
B1
C
D
E
E1
L
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.735/0.775
(18.669/19.685)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.355/0.400
(9.017/10.160)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
22PIN
8PIN
14PIN
16PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
1.145/1.155
(29.083/29.337)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.780/0.800
(19.812/20.320)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
18PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.880/0.920
(22.352/23.368)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
20PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.980/1.060
(24.892/26.924)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
8
D
E
H
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
8PIN
A
A1
L
B
e
h x 45
A
A1
B
D
E
e
H
h
L
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249
0.014/0.019
(0.35/0.49)
0.189/0.197
(4.80/5.00)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
14PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.337/0.344
(8.552/8.748)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
16PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.386/0.394
(9.802/10.000)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
SP9501DS/02
SP9501 12-Bit, Low-Power Voltage Output
Copyright 2000 Sipex Corporation
9
ORDERING INFORMATION
Model .................................................................................. Temperature Range ....................................................................................... Package
Monolithic 12-Bit DAC Voltage Output:
SP9501JN ................................................................................ 0C to +70C ........................................................................ 8-pin, 0.3" Plastic DIP
SP9501KN ............................................................................... 0C to +70C ........................................................................ 8-pin, 0.3" Plastic DIP
SP9501JS ................................................................................ 0C to +70C ............................................................................... 8pin, 0.15" SOIC
SP9501KS ............................................................................... 0
C to +70
C ................................................................................ 8pin, 0.15" SOIC
SP9501AN ............................................................................... 40C to +85C ................................................................... 8-pin, 0.3" Plastic DIP
SP9501BN ............................................................................... 40C to +85C ................................................................... 8-pin, 0.3" Plastic DIP
SP9501AS ............................................................................... 40C to +85C .......................................................................... 8pin, 0.15" SOIC
SP9501BS ............................................................................... 40
C to +85
C ............................................................................ 8pin, 0.15" SOIC
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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