MAX1078 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 1.8Msps, Single-Supply, Low-Power, True-Differential, 10-Bit ADCs with Internal Reference

19-3291; Rev 0; 5/04
1.8Msps, Single-Supply, Low-Power, True-
Differential, 10-Bit ADCs with Internal Reference
General Description
The MAX1076/MAX1078 are low-power, high-speed, seri-
al-output, 10-bit, analog-to-digital converters (ADCs) that
operate at up to 1.8Msps and have an internal reference.
These devices feature true-differential inputs, offering bet-
ter noise immunity, distortion improvements, and a wider
dynamic range over single-ended inputs. A standard
SPI™/QSPI™/MICROWIRE™ interface provides the clock
necessary for conversion. These devices easily interface
with standard digital signal processor (DSP) synchronous
serial interfaces.
The MAX1076/MAX1078 operate from a single +4.75V to
+5.25V supply voltage. The MAX1076/MAX1078 include
a 4.096V internal reference. The MAX1076 has a unipolar
analog input, while the MAX1078 has a bipolar analog
input. These devices feature a partial power-down mode
and a full power-down mode for use between conver-
sions, which lower the supply current to 2mA (typ) and
1µA (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 MAX1076/MAX1078
ideal for industrial process control, motor control, and
base-station applications.
The MAX1076/MAX1078 come in a 12-pin TQFN pack-
age, and are available in the commercial (0°C to +70°C)
and extended (-40°C to +85°C) temperature ranges.
Data Acquisition
Bill Validation
Motor Control
Applications
Communications
Portable Instruments
Features
♦ 1.8Msps Sampling Rate
♦ Only 50mW (typ) Power Dissipation
♦ Only 1µA (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)
♦ Internal 4.096V Reference
♦ No Pipeline Delays
♦ Small 12-Pin TQFN Package
Ordering Information
PART
MAX1076CTC-T
MAX1076ETC-T
MAX1078CTC-T
MAX1078ETC-T
TEMP RANGE ^PIN-
PACKAGE
0°C to +70°C 12 TQFN-12
-40°C to +85°C 12 TQFN-12
0°C to +70°C 12 TQFN-12
-40°C to +85°C 12 TQFN-12
INPUT
Unipolar
Unipolar
Bipolar
Bipolar
Pin Configuration
Typical Operating Circuit
TOP VIEW
AIN+ N.C. SCLK
12 11 10
AIN- 1
REF 2
RGND 3
MAX1076
MAX1078
9 CNVST
8 DOUT
7 V_L
4
5
6
V_DD N.C. GND
TQFN
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
+4.75V TO +5.25V
+1.8V TO V_DD
10µF
DIFFERENTIAL ₊
INPUT
VOLTAGE ^-
4.7µF 0.01µF
0.01µF
V_DD
0.01µF
V_L
AIN+
DOUT
AIN-
MAX1076
MAX1078 ^CNVST
SCLK
REF
RGND
GND
10µF
µC/DSP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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