19-2836; Rev 1; 9/03
Ultra-Low-Power, 7.5Msps, Dual 8-Bit ADC
General Description
Features
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.
ꢀ Ultra-Low Power
12mW (Normal Operation: 7.5Msps)
0.3µW (Shutdown Mode)
ꢀ Excellent Dynamic Performance
48.7dB SNR at f = 1.875MHz
IN
69dBc SFDR at f = 1.875MHz
IN
ꢀ 2.7V to 3.6V Single Analog Supply
ꢀ 1.8V to 3.6V TTL/CMOS-Compatible Digital
Outputs
ꢀ Fully Differential or Single-Ended Analog Inputs
ꢀ Internal/External Reference Option
ꢀ Multiplexed CMOS-Compatible Tri-State Outputs
ꢀ 28-Pin Thin QFN Package
ꢀ Evaluation Kit Available (Order MAX1193EVKIT)
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.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
28 Thin QFN-EP*
(5mm x 5mm)
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.
MAX1191ETI-T
-40°C to +85°C
*EP = Exposed paddle.
Pin Configuration
TOP VIEW
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.
INA-
INA+
GND
CLK
D0
D1
D2
1
2
3
4
5
6
7
21
20
19
Applications
Ultrasound and Medical Imaging
IQ Baseband Sampling
18 D3
Battery-Powered Portable Instruments
Low-Power Video
MAX1191
17
16
GND
INB+
INB-
A/B
D4
WLAN, Mobile DSL, WLL Receiver
EXPOSED PADDLE
15 D5
5mm x 5mm THIN QFN
________________________________________________________________ Maxim Integrated Products
1
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.
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