1989 Burr-Brown Corporation
PDS-1018E
Printed in U.S.A. October, 1993
12-Bit 3
s Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
333k SAMPLES PER SECOND
q
STANDARD
10V AND
5V INPUT
RANGES
q
DC PERFORMANCE OVER TEMP:
No Missing Codes
1/2LSB Integral Linearity Error
3/4LSB Differential Linearity Error
q
AC PERFORMANCE OVER TEMP:
72dB Signal-to-Noise Ratio
80dB Spurious-free Dynamic Range
80dB Total Harmonic Distortion
q
INTERNAL SAMPLE/HOLD, REFERENCE,
CLOCK, AND 3-STATE OUTPUTS
q
POWER DISSIPATION: 215mW max
q
PACKAGE: 24-Pin Single-wide DIP
24-Lead SOIC
Comparator
Control
Logic
Internal
Ref
2V
Reference
Out
5V
IN
10V
IN
CDAC
SAR
BUSY
Three
State
Parallel
Output
Data
Bus
Clock
Output
Latches
And
Three
State
Drivers
ADS7800
DESCRIPTION
The ADS7800 is a complete 12-bit sampling analog-
to-digital converter using state-of-the-art CMOS struc-
tures. It contains a complete 12-bit successive ap-
proximation A/D converter with internal sample/hold,
reference, clock, digital interface for microprocessor
control, and three-state output drivers.
The ADS7800 is specified at a 333kHz sampling rate.
Conversion time is factory set for 2.70
s max over
temperature, and the high speed sampling input stage
insures a total acquisition and conversion time of 3
s
max over temperature. Precision, laser-trimmed scal-
ing resistors provide industry-standard input ranges of
5V or
10V.
AC and DC performance are completely specified.
Two grades based on linearity and dynamic perform-
ance are available to provide the optimum price/
performance fit in a wide range of applications.
The 24-pin ADS7800 is available in plastic and side-
braze hermetic 0.3" wide DIPs, and in an SOIC
package. It operates from a +5V supply and either a
12V or 15V supply. The ADS7800 is available in
grades specified over 0
C to +70
C and 40
C to
+85
C temperature ranges.
International Airport Industrial Park Mailing Address: PO Box 11400, Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 Tel: (520) 746-1111 Twx: 910-952-1111
Internet: http://www.burr-brown.com/ FAXLine: (800) 548-6133 (US/Canada Only) Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
ADS7800
2
SPECIFICATIONS
ELECTRICAL
At T
A
= T
MIN
to T
MAX
, Sampling Frequency, f
S
, = 333kHz, V
S
= 15V, V
S
= +5V, unless otherwise specified.
ADS7800JP/JU/AH
ADS7800KP/KU/BH
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
RESOLUTION
12
*
Bits
ANALOG INPUT
Voltage Ranges
10V/
5V
*
V
Impedance
10V Range
4.4
6.3
8.1
*
*
*
k
5V Range
2.9
4.2
5.4
*
*
*
k
THROUGHPUT SPEED
Conversion Time
Conversion Alone
2.5
2.7
*
*
s
Complete Cycle
Acquisition + Conversion
2.6
3.0
*
*
s
Throughput Rate
333
380
*
*
kHz
DC ACCURACY
Full Scale Error
(1)
0.50
0.35
%
Full Scale Error Drift
6
*
ppm/
C
Integral Linearity Error
1
1/2
LSB
(2)
Differential Linearity Error
1
3/4
LSB
No Missing Codes
Guaranteed
Guaranteed
Bipolar Zero
(1)
4
2
LSB
Bipolar Zero Drift
1
*
ppm/
C
Power Supply Sensitivity
16.5V < V
S
< 13.5V
1/2
*
LSB
12.6V < V
S
< 11.4V
1/2
*
LSB
+4.75V < V
S
< +5.25V
1
1/2
LSB
Transition Noise
(3)
0.1
*
LSB
AC ACCURACY
Spurious-Free Dynamic Range
f
IN
= 47kHz
74
77
77
80
dB
(4)
Total Harmonic Distortion
f
IN
= 47kHz
77
74
80
77
dB
Two-tone Intermodulation Distortion
f
IN1
= 24.4kHz (6dB)
77
74
80
77
dB
f
IN2
= 28.5kHz (6dB)
Signal-to-(Noise + Distortion) Ratio
f
IN
= 47kHz
67
70
69
72
dB
Signal-to-Noise Ratio (SNR)
f
IN
= 47kHz
68
71
70
73
dB
SAMPLING DYNAMICS
Aperture Delay
13
*
ns
Aperture Jitter
150
*
ps, rms
Transient Response
(5)
130
*
ns
Overvoltage Recovery
(6)
150
*
ns
INTERNAL REFERENCE VOLTAGE
Voltage
1.9
2.0
2.1
*
*
*
V
Source Current Available
10
*
A
for External Loads
DIGITAL INPUTS
Logic Levels
V
IL
0.3
+0.8
*
*
V
V
IH
+2.4
+5.3
*
*
V
I
IL
5
*
A
I
IH
+5
*
A
DIGITAL OUTPUTS
Data Format
Parallel, 12-bit or 8-bit/4-bit
Data Coding
Binary Offset Binary
V
OL
I
SINK
= 1.6mA
0.0
+0.4
*
*
V
V
OH
I
SOURCE
= 500
A
+2.4
+5.0
*
*
V
I
LEAKAGE
(High-Z State)
0.1
5
*
*
A
POWER SUPPLIES
Rated Voltage
V
S
11.4
15
16.5
*
*
*
V
V
S
(V
SA
and V
SD
)
+4.75
+5.0
+5.25
*
*
*
V
Current
I
S
3.5
6
*
*
mA
I
S
18
25
*
*
mA
Power Consumption
135
215
*
*
mW
3
ADS7800
SPECIFICATIONS
(CONT)
ELECTRICAL
At T
A
= T
MIN
to T
MAX
, Sampling Frequency, f
S
, = 333kHz, V
S
= 15V, V
S
= +5V, unless otherwise specified.
ADS7800JP/JU/AH
ADS7800KP/KU/BH
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
TEMPERATURE RANGE
Specification
JP/JU/KP/KU
0
+70
*
*
C
AH/BH
40
+85
*
*
C
Operating
JP/KP/JU/KU
40
+85
*
*
C
Storage
65
+150
*
*
C
* Same as specification for ADS7800JP/JU/AH.
NOTES: (1) Adjustable to zero with external potentiometer. (2) LSB means Least Significant Bit. For ADS7800, 1LSB = 2.44mV for the
5V range, 1LSB =
4.88mV for the
10V range. (3) Noise was characterized over temperature near full scale, 0V, and negative full scale. 0.1LSB represents a typical rms level of
noise at the worst case, which was near full scale input at +125
C. (4) All specifications in dB are referred to a full-scale input, either
10V or
5V. (5) For full
scale step input, 12-bit accuracy attained in specified time. (6) Recovers to specified performance in specified time after 2 x F
S
input overvoltage.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
ABSOLUTE MAXIMUM RATINGS
V
S
to ANALOG COMMON ............................................................ 16.5V
V
S
to DIGITAL COMMON .................................................................... +7V
Pin 23 (V
SD
) to Pin 24 (V
SA
) ...........................................................
0.3V
ANALOG COMMON to DIGITAL COMMON ........................................
1V
Control Inputs to DIGITAL COMMON ............................. 0.3 to V
S
+ 0.3V
Analog Input Voltage ..........................................................................
20V
Maximum Junction Temperature ..................................................... 160
C
Internal Power Dissipation ............................................................. 750mW
Lead Temperature (soldering, 10s) ................................................ +300
C
Thermal Resistance,
JA
:
Plastic DIP ................................................................................ 100
C/W
SOIC ......................................................................................... 100
C/W
Ceramic ...................................................................................... 50
C/W
ELECTROSTATIC
DISCHARGE SENSITIVITY
The ADS7800 is an ESD (electrostatic discharge) sensitive
device. The digital control inputs have a special FET struc-
ture, which turns on when the input exceeds the supply by
18V, to minimize ESD damage. However, permanent damage
may occur on unconnected devices subject to high energy
electrostatic fields. When not in use, devices must be stored in
conductive foam or shunts. The protective foam should be
discharged to the destination socket before devices are re-
moved.
PACKAGE/ORDERING INFORMATION
INTEGRAL
SIGNAL-TO-
SPECIFICATION
LINEARITY
(NOISE+DISTORTION)
TEMPERATURE
PACKAGE DRAWING
PRODUCT
ERROR (LSB)
RATIO (dB min)
RANGE (
C)
PACKAGE
NUMBER
(1)
ADS7800JP
1
67
0 to +70
24-Pin Plastic DIP
243
ADS7800KP
1/2
69
0 to +70
24-Pin Plastic DIP
243
ADS7800JU
1
67
0 to +70
24-Pin Plastic SOIC
239
ADS7800KU
1/2
69
0 to +70
24-Pin Plastic SOIC
239
ADS7800AH
1
67
40 to +85
24-Pin Ceramic DIP
245
ADS7800BH
1/2
69
40 to +85
24-Pin Ceramic DIP
245
NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book.
ADS7800
4
PIN ASSIGNMENTS
PIN #
NAME
DESCRIPTION
1
IN1
10V Analog Input. Connected to GND for
5V range.
2
IN2
5V Analog Input. Connected to GND for
10V range.
3
REF
+2V Reference Output. Bypass to GND with 22
F to
47
F Tantalum. Buffer for external loads.
4
AGND
Analog Ground. Connect to pin 13.
5
D11
Data Bit 11. Most Significant Bit (MSB).
6
D10
Data Bit 10.
7
D9
Data Bit 9.
8
D8
Data Bit 8.
9
D7
Data Bit 7 if HBE is LOW; LOW if HBE is HIGH.
10
D6
Data Bit 6 if HBE is LOW; LOW if HBE is HIGH.
11
D5
Data Bit 5 if HBE is LOW; LOW if HBE is HIGH.
12
D4
Data Bit 4 if HBE is LOW; LOW if HBE is HIGH.
13
DGND
Digital Ground. Connect to pin 4.
14
D3
Data Bit 3 if HBE is LOW; Data Bit 11 if HBE is HIGH.
15
D2
Data Bit 2 if HBE is LOW; Data Bit 10 if HBE is HIGH.
16
D1
Data Bit 1 if HBE is LOW; Data Bit 9 if HBE is HIGH.
17
D0
Data Bit 0 if HBE is LOW. Least Significant Bit (LSB);
Data Bit 8 if HBE is HIGH.
18
HBE
High Byte Enable. When held LOW, data output as 12-
bits in parallel. When held HIGH, four MSBs presented on
pins 14-17, pins 9-12 output LOWs. Must be LOW to
initiate conversion.
19
R/C
Read/Convert. Falling edge initiates conversion when CS
is LOW, HBE is LOW, and BUSY is HIGH.
20
CS
Chip Select. Outputs in Hi-Z state when HIGH. Must be
LOW to initiate conversion or read data.
21
BUSY
Busy. Output LOW during conversion. Data valid on rising
edge in Convert Mode.
22
V
S
Negative Power Supply. 12V or 15V. Bypass to GND.
23
V
SD
Positive Digital Power Supply. +5V. Connect to pin 24,
and bypass to GND.
24
V
SA
Positive Analog Power Supply. +5V. Connect to pin 23,
and bypass to GND.
PIN CONFIGURATION
Top View
DIP/SOIC
1
2
3
4
5
6
7
8
9
10
11
12
IN1
IN2
REF
AGND
D11
D10
D9
D8
D7
D6
D5
D4
24
23
22
21
20
19
18
17
16
15
14
13
V
V
V
BUSY
CS
R/C
HBE
D0
D1
D2
D3
DGND
SA
SD
S
5
ADS7800
0
20
40
60
80
100
120
0
165
Frequency (kHz)
Magnitude (dB)
50
100
150
0
20
40
60
80
100
120
0
165
Frequency (kHz)
Magnitude (dB)
50
100
150
80
60
40
20
0
1
SIGNAL/(NOISE + DISTORTION) vs
FREQUENCY AND AMPLITUDE
10
50
150
Input Frequency (kHz)
Signal/(Noise + Distortion) (dB)
0dB
20dB
40dB
60dB
95
90
85
80
75
70
65
1
SPURIOUS FREE DYNAMIC RANGE vs
INPUT FREQUENCY AND AMBIENT TEMPERATURE
10
50
150
Input Frequency (kHz)
Spurious Free Dynamic Range (dB)
55C
+25C
+125C
75
70
65
1
SIGNAL/(NOISE + DISTORTION) vs
INPUT FREQUENCY AND AMBIENT TEMPERATURE
10
50
150
Input Frequency (kHz)
Signal/(Noise + Distortion) (dB)
55C
+25C
+125C
FREQUENCY SPECTRUM (10kHz f
IN
)
FREQUENCY SPECTRUM (50kHz f
IN
)
f
IN
= 10kHz
f
SAMPLING
= 330kHz
T
A
= 25
C
f
IN
= 50kHz
f
SAMPLING
= 330kHz
T
A
= 25
C
TYPICAL PERFORMANCE CURVES
At +V
S
= +5V, V
S
= 15V, and T
A
= +25
C, unless otherwise noted. All plots use 1024 point FFTs.
95
90
85
80
75
70
65
1
SPURIOUS FREE DYNAMIC RANGE vs
INPUT FREQUENCY AND NEGATIVE SUPPLY VOLTAGE
10
50
150
Input Frequency (kHz)
Spurious Free Dynamic Range (dB)
V = 15V
S
S
V = 12V
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