19-4126; Rev 1; 2/ꢀ9
Dual, 12-Bit, 1.25Msps Simultaneous-Sampling
ADCs with Serial Interface
79/MAX183
General Description
Features
♦ Dual, Simultaneous-Sampling, 12-Bit Successive
The MAX1377/MAX1379/MAX1383 feature two simulta-
neous-sampling, low-power, 12-bit ADCs with serial
interface and internal voltage reference. Fast sampling
rate, low power dissipation, and excellent dynamic per-
formance make the MAX1377/MAX1379/MAX1383
ideal for industrial process control, motor control, and
RF applications.
Approximation Register (SAR) ADCs
♦ 2 x 2 Mux Inputs or Two Differential Inputs
♦ 1.25Msps Sampling Rate per ADC
♦ Internal or External Reference
♦ Excellent Dynamic Performance
70dB SINAD (MAX1377)
Conversion results are available through a SPI™-/
QSPI™-/MICROWIRE™-/DSP-compatible interface with
independent serial digital outputs for each channel. The
serial outputs allow twice as much data to be transferred
at the given clock rate. The conversion results for both
ADCs can also be output on a single digital output for
microcontrollers (µCs) and DSPs with only a single serial
input available.
71dB SINAD (MAX1379/MAX1383)
84dBc/SFDR
1MHz Full-Linear Bandwidth
♦ 2.7V to 3.6V Low-Power Operation (MAX1377)
50mW (Normal Operation)
6mW (Partial Power-Down)
3µW (Full Power-Down)
♦ 4.75V to 5.25V Low-Power Operation (MAX1379)
90mW (Normal Operation)
The MAX1377 operates from a 2.7V to 3.6V analog sup-
ply and the MAX1379/MAX1383 operate from a 4.75V
to 5.25V analog supply. A separate 1.8V to AVDD digi-
tal supply allows interfacing to low voltage logic without
the use of level translators.
10mW (Partial Power-Down)
5µW (Full Power-Down)
♦ 4.75V to 5.25V Low-Power Operation (MAX1383)
280mW (Normal Operation)
2.5µW (Full Power-Down)
Two power-down modes, partial and full, allow the
MAX1377/MAX1379 and MAX1383 (full power-down only)
to save power between conversions. Partial power-down
mode reduces the supply current to 2mA while leaving
the reference enabled for quick power-up. Full power-
down mode reduces the supply current to 1µA.
♦ 20MHz, SPI-Compatible, 3-Wire Serial Interface
User-Selectable Single (0.625Msps max) or Dual
Outputs (1.25Msps max)
♦ Input Range: 10V (MAX1383), 0ꢀV
or
REF
V
REF
/2 (MAX1377/MAX1379)
♦ Small 20-Pin TQFN Package
The MAX1377/MAX1379 inputs accept voltages
SPI/QSPI are trademarks of Motorola, Inc.
between zero and the reference voltage or
V
/2.
REF
MICROWIRE is a trademark of National Semiconductor Corp.
The MAX1383 offers an input voltage range of 1ꢀV,
which is ideal for industrial and motor-control applica-
tions. The input to each of the ADCs supports either a
true-differential input or two single-ended inputs.
Functional Diagram
V
AVDD
L
AIN1A
AIN1B
The MAX1377/MAX1379/MAX1383 are available in a
2ꢀ-pin TQFN package, and are specified for the automo-
tive (-4ꢀ°C to +125°C) temperature range.
MAX1377
MAX1379
MAX1383
12-BIT
SAR
ADC1
MUX
T/H
DOUT1
OUTPUT
BUFFER
Applications
Bill Validation
CS
REF
SERIAL
INTERFACE
AND TIMING
REFSEL
CNVST
SCLK
Motor Control
Communications
Data Acquisition
Portable Instruments
A = 1
INTERNAL
REFERENCE
RGND
U/B
S/D
CONTROL
LOGIC
Ordering Information
V
L
PART
TEMP RANGE
PIN-PACKAGE
2ꢀ TQFN-EP*
2ꢀ TQFN-EP*
2ꢀ TQFN-EP*
AIN2A
AIN2B
12-BIT
SAR
ADC2
T/H
MUX
DOUT2
OUTPUT
BUFFER
MAX1377ATP+
MAX1379ATP+
MAX1383ATP+
-4ꢀ°C to +125°C
-4ꢀ°C to +125°C
-4ꢀ°C to +125°C
AGND
SEL
DGND
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
________________________________________________________________ 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.