General Description
The MAX1070/MAX1071 low-power, high-speed, serial-
output, 10-bit, analog-to-digital converters (ADCs) oper-
ate at up to 1.5Msps. These devices feature true-differen-
tial inputs, offering better noise immunity, distortion
improvements, and a wider dynamic range over single-
ended inputs. A standard SPITM/QSPITM/MICROWIRETM
interface provides the clock necessary for conversion.
These devices easily interface with standard digital signal
processor (DSP) synchronous serial interfaces.
The MAX1070/MAX1071 operate from a single +2.7V to
+3.6V supply voltage and require an external reference.
The MAX1070 has a unipolar analog input, while the
MAX1071 has a bipolar analog input. These devices fea-
ture a partial power-down mode and a full power-down
mode for use between conversions, which lower the sup-
ply current to 1mA (typ) and 1A (max), respectively. Also
featured is a separate power-supply input (V
L
), which
allows direct interfacing to +1.8V to V
DD
digital logic. The
fast conversion speed, low-power dissipation, excellent
AC performance, and DC accuracy (0.5 LSB INL) make
the MAX1070/MAX1071 ideal for industrial process con-
trol, motor control, and base-station applications.
The MAX1070/MAX1071 come in a 12-pin TQFN pack-
age, and are available in the commercial (0C to +70C)
and extended (-40C to +85C) temperature ranges.
Applications
Data Acquisition
Bill Validation
Motor Control
Communications
Portable Instruments
Features
1.5Msps Sampling Rate
Only 18mW (typ) Power Dissipation
Only 1A (max) Shutdown Current
High-Speed, SPI-Compatible, 3-Wire Serial Interface
61dB S/(N + D) at 525kHz Input Frequency
Internal True-Differential Track/Hold (T/H)
External Reference
No Pipeline Delays
Small 12-Pin TQFN Package
MAX1070/MAX1071
1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
________________________________________________________________ Maxim Integrated Products
1
12
AIN+
11
N.C.
10
SCLK
4
5
N.C.
6
GND
1
2
REF
3
9
8
7
RGND
CNVST
DOUT
V
L
MAX1070
MAX1071
AIN-
V
DD
TQFN
TOP VIEW
PART
TEMP RANGE
PIN-
PACKAGE
INPUT
MAX1070
CTC-T
0
C to +70
C
12 TQFN-12
Unipolar
MAX1070ETC-T
-40
C to +85
C
12 TQFN-12
Unipolar
MAX1071
CTC-T
0
C to +70
C
12 TQFN-12
Bipolar
MAX1071ETC-T
-40
C to +85
C
12 TQFN-12
Bipolar
Pin Configuration
Ordering Information
MAX1070
MAX1071
DOUT
AIN+
REF
4.7F
10F
10F
+2.7V TO +3.6V
0.01F
0.01F
0.01F
+1.8V TO V
DD
AIN-
REF
V
DD
DIFFERENTIAL
INPUT
VOLTAGE
RGND
V
L
GND
CNVST
SCLK
C/DSP
+
-
Typical Operating Circuit
19-3292; Rev 0; 5/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
MAX1070/MAX1071
1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +3.6V, V
L
= V
DD
, V
REF
= 2.048V, f
SCLK
= 24.0MHz, 50% duty cycle, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
DD
= 3V and T
A
= +25C.)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND ..............................................................-0.3V to +6V
V
L
to GND ................-0.3V to the lower of (V
DD
+ 0.3V) and +6V
Digital Inputs
to GND .................-0.3V to the lower of (V
DD
+ 0.3V) and +6V
Digital Output
to GND ....................-0.3V to the lower of (V
L
+ 0.3V) and +6V
Analog Inputs and
REF to GND..........-0.3V to the lower of (V
DD
+ 0.3V) and +6V
RGND to GND .......................................................-0.3V to +0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70C)
12-Pin TQFN (derate 16.9mW/C above +70C) ......1349mW
Operating Temperature Ranges
MAX107_ CTC ...................................................0C to +70C
MAX107_ ETC.................................................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-60C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY
Resolution
10
Bits
Relative Accuracy
INL
(Note 1)
0.5
LSB
Differential Nonlinearity
DNL
(Note 2)
0.5
LSB
Offset Error
2
LSB
Offset-Error Temperature
Coefficient
1
ppm/C
Gain Error
Offset nulled
2
LSB
Gain Temperature Coefficient
2
ppm/C
DYNAMIC SPECIFICATIONS
(f
IN
= 525kHz sine wave, V
IN
= V
REF
, unless otherwise noted.)
Signal-to-Noise Plus Distortion
SINAD
60
61
dB
Total Harmonic Distortion
THD
Up to the 5th harmonic
-80
-74
dB
Spurious-Free Dynamic Range
SFDR
-80
-74
dB
Intermodulation Distortion
IMD
f
IN1
= 250kHz, f
IN2
= 300kHz
-78
dB
Full-Power Bandwidth
-3dB point
15
MHz
Full-Linear Bandwidth
S/(N + D) > 56dB, single ended
2
MHz
CONVERSION RATE
Minimum Conversion Time
t
CONV
(Note 3)
0.667
s
Maximum Throughput Rate
1.5
Msps
M i ni m um Thr oug hp ut Rate
( N ote 4)
10
ksps
Track-and-Hold Acquisition Time
t
ACQ
(Note 5)
125
ns
Aperture Delay
5
ns
Aperture Jitter
(Note 6)
30
ps
External Clock Frequency
f
SCLK
(Note 7)
24.0
MHz
MAX1070/MAX1071
1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V, V
L
= V
DD
, V
REF
= 2.048V, f
SCLK
= 24.0MHz, 50% duty cycle, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
DD
= 3V and T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG INPUTS (AIN+, AIN-)
AIN+ - AIN-, MAX1070
0
V
REF
Differential Input Voltage Range
V
IN
AIN+ - AIN-, MAX1071
-V
REF
/ 2
+V
REF
/ 2
V
Absolute Input Voltage Range
0
V
DD
V
DC Leakage Current
1
A
Input Capacitance
Per input pin
16
pF
Input Current (Average)
Time averaged at maximum throughput rate
50
A
REFERENCE INPUT (REF)
REF Input Voltage Range
V
REF
1.0
V
DD
+
50mV
V
Input Capacitance
20
pF
DC Leakage Current
1
A
Input Current (Average)
Time averaged at maximum throughput rate
200
A
DIGITAL INPUTS (SCLK, CNVST)
Input-Voltage Low
VIL
0.3 x V
L
V
Input-Voltage High
VIH
0.7 x V
L
V
Input Leakage Current
I
IL
0.05
10
A
DIGITAL OUTPUT (DOUT)
Output Load Capacitance
C
OUT
For stated timing performance
30
pF
Output-Voltage Low
V
OL
I
SINK
= 5mA, V
L
1.8V
0.4
V
Output-Voltage High
V
OH
I
SOURCE
= 1mA, V
L
1.8V
V
L
- 0.5V V
Output Leakage Current
I
OL
Output high impedance
0.2
10
A
POWER REQUIREMENTS
Analog Supply Voltage
V
DD
2.7
3.6
V
Digital Supply Voltage
V
L
1.8
V
DD
V
Static, f
SCLK
= 24.0
5
7
Static, no SCLK
4
5
Analog Supply Current,
Normal Mode
I
DD
Operational,
1.5Msps
6
8
mA
f
SCLK
= 24.0MHz
1
Analog Supply Current,
Partial Power-Down Mode
I
DD
No SCLK
1
mA
f
SCLK
= 24.0MHz
1
Analog Supply Current,
Full Power-Down Mode
I
DD
No SCLK
0.3
1
A
Operational, full-scale input at 1.5Msps
0.3
1
Static, f
SCLK
= 24.0MHz
0.15
0.5
Partial/full power-down mode,
f
SCLK
= 24.0MHz
0.1
0.3
mA
Digital Supply Current (Note 8)
Static, no SCLK (all modes)
0.1
1
A
Positive-Supply Rejection
PSR
Full-scale input, 3V +20%, -10%
0.2
3.0
mV
MAX1070/MAX1071
1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
4
_______________________________________________________________________________________
Note 1:
Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and the offset
error have been nulled.
Note 2:
No missing codes over temperature.
Note 3:
Conversion time is defined as the number of clock cycles (16) multiplied by the clock period.
Note 4:
At sample rates below 10ksps, the input full-linear bandwidth is reduced to 5kHz.
Note 5:
The listed value of three SCLK cycles is given for full-speed continuous conversions. Acquisition time begins on the 14th ris-
ing edge of SCLK and terminates on the next falling edge of CNST. The IC idles in acquisition mode between conversions.
Note 6:
Undersampling at the maximum signal bandwidth requires the minimum jitter spec for SINAD performance.
Note 7:
1.5Msps operation guaranteed for V
L
> 2.7V. See the Typical Operating Characteristics section for recommended sampling
speeds for V
L
< 2.7V.
Note 8:
Digital supply current is measured with the V
IH
level equal to V
L
, and the V
IL
level equal to GND.
TIMING CHARACTERISTICS
(V
DD
= +2.7V to +3.6V, V
L
= V
DD
, V
REF
= 2.048V, f
SCLK
= 24.0MHz, 50% duty cycle, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Typical values are at V
DD
= 3V and T
A
= +25C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
L
= 2.7V to V
DD
18.7
SCLK Pulse-Width High
t
CH
V
L
= 1.8V to V
DD
, minimum recommended
(Note 7)
22.5
ns
V
L
= 2.7V to V
DD
18.7
SCLK Pulse-Width Low
t
CL
V
L
= 1.8V to V
DD
, minimum recommended
(Note 7)
22.5
ns
C
L
= 30pF, V
L
= 2.7V to V
DD
17
SCLK Rise to DOUT Transition
t
DOUT
C
L
= 30pF, V
L
= 1.8V to V
DD
24
ns
DOUT Remains Valid After SCLK
t
DHOLD
V
L
= 1.8V to V
DD
4
ns
CNVST Fall to SCLK Fall
t
SETUP
V
L
= 1.8V to V
DD
10
ns
CNVST Pulse Width
t
CSW
V
L
= 1.8V to V
DD
20
ns
Power-Up Time; Full Power-Down
t
PWR-UP
2
ms
Restart Time; Partial Power-Down
t
RCV
16
Cycles
CNVST
SCLK
DOUT
t
DHOLD
t
DOUT
t
SETUP
t
CSW
t
CL
t
CH
Figure 1. Detailed Serial-Interface Timing
GND
6k
C
L
DOUT
DOUT
C
L
GND
V
L
a) HIGH-Z TO V
OH
, V
OL
TO V
OH
,
AND V
OH
TO HIGH-Z
b) HIGH-Z TO V
OL
, V
OH
TO V
OL
,
AND V
OL
TO HIGH-Z
6k
Figure 2. Load Circuits for Enable/Disable Times
MAX1070/MAX1071
1.5Msps, Single-Supply, Low-Power,
True-Differential, 10-Bit ADCs
_______________________________________________________________________________________
5
Typical Operating Characteristics
(V
DD
= +3V, V
L
= V
DD
, V
REF
= 2.048V, f
SCLK
= 24MHz, f
SAMPLE
= 1.5Msps, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values
are at T
A
= +25C.)
MAXIMUM RECOMMENDED f
SCLK
vs. V
L
MAX1070/71 toc01
V
L
(V)
f
SCLK
(MHz)
3.3
3.0
2.7
2.4
2.1
19
21
23
25
17
1.8
3.6
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1070)
MAX1070/71 toc02
DIGITAL OUTPUT CODE
INL (LSB)
768
512
256
-0.1
0
0.1
0.2
-0.2
0
1024
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1071)
MAX1070/71 toc03
DIGITAL OUTPUT CODE
INL (LSB)
256
0
-256
-0.1
0
0.1
0.2
-0.2
-512
512
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1070)
MAX1070/71 toc04
DIGITAL OUTPUT CODE
DNL (LSB)
768
512
256
-0.1
0
0.1
0.2
-0.2
0
1024
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1071)
MAX1070/71 toc05
DIGITAL OUTPUT CODE
DNL (LSB)
256
0
-256
-0.1
0
0.1
0.2
-0.2
-512
512
OFFSET ERROR
vs. TEMPERATURE (MAX1070)
MAX1070/71 toc06
TEMPERATURE (C)
OFFSET ERROR (LSB)
60
35
-15
10
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
-1.00
-40
85
OFFSET ERROR
vs. TEMPERATURE (MAX1071)
MAX1070/71 toc07
TEMPERATURE (C)
OFFSET ERROR (LSB)
60
35
-15
10
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
-1.00
-40
85
GAIN ERROR
vs. TEMPERATURE (MAX1070)
MAX1070/71 toc08
TEMPERATURE (C)
GAIN ERROR (LSB)
60
35
-15
10
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
-1.00
-40
85
GAIN ERROR
vs. TEMPERATURE (MAX1071)
MAX1070/71 toc09
TEMPERATURE (C)
GAIN ERROR (LSB)
60
35
-15
10
-0.75
-0.50
-0.25
0
0.25
0.50
0.75
1.00
-1.00
-40
85
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