MAX1191 Datasheet, PDF (1/27 Pages) Maxim Integrated Products – Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC

19-2836; Rev 1; 9/03
Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC
General Description
The MAX1191 is an ultra-low-power, dual, 8-bit,
7.5Msps analog-to-digital converter (ADC). The device
features two fully differential wideband track-and-hold
(T/H) inputs. These inputs have a 440MHz bandwidth
and accept fully differential or single-ended signals.
The MAX1191 delivers a typical signal-to-noise and dis-
tortion (SINAD) of 48.6dB at an input frequency of
1.875MHz and a sampling rate of 7.5Msps while con-
suming only 12mW. This ADC operates from a 2.7V to
3.6V analog power supply. A separate 1.8V to 3.6V
supply powers the digital output driver. In addition to
ultra-low operating power, the MAX1191 features three
power-down modes to conserve power during idle peri-
ods. Excellent dynamic performance, ultra-low power,
and small size make the MAX1191 ideal for applica-
tions in imaging, instrumentation, and digital communi-
cations.
An internal 1.024V precision bandgap reference sets
the full-scale range of the ADC to ±0.512V. A flexible
reference structure allows the MAX1191 to use its inter-
nal reference or accept an externally applied reference
for applications requiring increased accuracy.
The MAX1191 features parallel, multiplexed, CMOS-
compatible tri-state outputs. The digital output format is
offset binary. A separate digital power input accepts a
voltage from 1.8V to 3.6V for flexible interfacing to dif-
ferent logic levels. The MAX1191 is available in a 5mm
× 5mm, 28-pin thin QFN package, and is specified for
the extended industrial (-40°C to +85°C) temperature
range.
For higher sampling frequency applications, refer to the
MAX1195–MAX1198 dual 8-bit ADCs. Pin-compatible
versions of the MAX1191 are also available. Refer to the
MAX1192 data sheet for 22Msps, and the MAX1193
data sheet for 45Msps.
Applications
Ultrasound and Medical Imaging
IQ Baseband Sampling
Battery-Powered Portable Instruments
Low-Power Video
WLAN, Mobile DSL, WLL Receiver
Features
o Ultra-Low Power
12mW (Normal Operation: 7.5Msps)
0.3µW (Shutdown Mode)
o Excellent Dynamic Performance
48.7dB SNR at f_IN = 1.875MHz
69dBc SFDR at f_IN = 1.875MHz
o 2.7V to 3.6V Single Analog Supply
o 1.8V to 3.6V TTL/CMOS-Compatible Digital
Outputs
o Fully Differential or Single-Ended Analog Inputs
o Internal/External Reference Option
o Multiplexed CMOS-Compatible Tri-State Outputs
o 28-Pin Thin QFN Package
o Evaluation Kit Available (Order MAX1193EVKIT)
Ordering Information
PART
TEMP RANGE
MAX1191ETI-T
-40°C to +85°C
*EP = Exposed paddle.
PIN-PACKAGE
28 Thin QFN-EP*
(5mm x 5mm)
TOP VIEW
Pin Configuration
INA- 1
INA+ 2
GND 3
CLK 4
GND 5
INB+ 6
INB- 7
MAX1191
EXPOSED PADDLE
21 D0
20 D1
19 D2
18 D3
17 A/B
16 D4
15 D5
5mm x 5mm THIN QFN
________________________________________________________________ Maxim Integrated Products 1
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1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.