MAX1277_09 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs with Internal Reference

19-3365; Rev 1; 4/09
1.5Msps, Single-Supply, Low-Power, True-
Differential, 12-Bit ADCs with Internal Reference
General Description
The MAX1277/MAX1279 are low-power, high-speed, seri-
al-output, 12-bit, analog-to-digital converters (ADCs) with
an internal reference that operates at up to 1.5Msps.
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 MAX1277/MAX1279 operate from a single +2.7V to
+3.6V supply voltage. The MAX1277/MAX1279 include a
2.048V internal reference. The MAX1277 has a unipolar
analog input, while the MAX1279 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 (±1 LSB INL) make the MAX1277/MAX1279
ideal for industrial process control, motor control, and
base-station applications.
The MAX1277/MAX1279 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
Data Acquisition
Bill Validation
Motor Control
Applications
Communications
Portable Instruments
Pin Configuration
TOP VIEW
AIN+ N.C. SCLK
12 11 10
AIN- 1
REF 2
RGND 3
MAX1277
MAX1279
9 CNVST
8 DOUT
7 V_L
4
5
6
V_DD N.C. GND
TQFN
Features
o 1.5Msps Sampling Rate
o Only 22mW (typ) Power Dissipation
o Only 1µA (max) Shutdown Current
o High-Speed, SPI-Compatible, 3-Wire Serial Interface
o 68.5dB S/(N + D) at 525kHz Input Frequency
o Internal True-Differential Track/Hold (T/H)
o Internal 2.048V Reference
o No Pipeline Delays
o Small 12-Pin TQFN Package
Ordering Information
PART
MAX1277AETC-T
MAX1277BETC-T
MAX1279AETC-T
MAX1279BETC-T
TEMP RANGE
PIN-
PACKAGE
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
INPUT
Unipolar
Unipolar
Bipolar
Bipolar
Typical Operating Circuit
+2.7V TO +3.6V
+1.8V TO V_DD
10μF
0.01μF
0.01μF
V_DD
V_L
DIFFERENTIAL ₊
INPUT
VOLTAGE ^-
4.7μF
0.01μF
AIN+
DOUT
AIN-
MAX1277
MAX1279 _CNVST
SCLK
REF
RGND
GND
10μF
μC/DSP
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.