Rainbow Electronics MAX1425 - Manual

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General Description
The MAX1425 10-bit, monolithic analog-to-digital con-
verter (ADC) is capable of a 20Msps sampling rate. This
device features an internal track-and-hold (T/H) amplifier
for excellent dynamic performance; at the same time, it
minimizes the number of external components. Low
input capacitance of only 8pF minimizes input drive
requirements. A wide input bandwidth (up to 150MHz)
makes this device suitable for digital RF/IF downconvert-
er applications employing undersampling techniques.
The MAX1425 employs a differential pipelined architec-
ture with a wideband T/H amplifier to maximize through-
put while limiting power consumption to only 172mW.
The MAX1425 generates an internal +2.5V reference
that supplies three additional reference voltages
(+3.25V, +2.25V, and +1.25V). These reference volt-
ages provide a differential input range of +2V to -2V.
The analog inputs are biased internally to correct the
DC level, eliminating the need for external biasing on
AC-coupled applications.
A separate +3V digital logic supply input allows for
separation of digital and analog circuitry. The output
data is in two’s complement format. The MAX1425 is
available in the space-saving 28-pin SSOP package.
For a pin-compatible version at a lower data rate, refer
to the MAX1426 data sheet. For a higher data rate, refer
to the MAX1424 data sheet.
Applications
Medical Ultrasound Imaging
CCD Pixel Processing
IR Focal Plane Array
Radar
IF and Baseband Digitization
Set-Top Boxes
Features
♦ Differential Inputs for High Common-Mode
Noise Rejection
♦ Signal-to-Noise Ratio
61dB (at f IN = 2MHz)
59.3dB (at f IN = 10MHz)
♦ Internal +2.5V Reference
♦ 150MHz Input Bandwidth
♦ Wide ±2V Input Range
♦ Low Power Consumption: 172mW
♦ Separate Digital Supply Input for 3V Logic
Compatibility
♦ Single +5V Supply Operation Possible
MAX1425
10-Bit, 20Msps ADC
________________________________________________________________ Maxim Integrated Products 1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D0
D1
D2
D3
D4
DGND
D9
DV
DD
DGND
DV DD
D5
D6
D7
D8
OE/PD
CLK
CMLN
CMLP
INN
INP
AV DD
AGND
CML
REFN
REFIN
REFP
AV DD
AGND
SSOP
TOP VIEW
MAX1425
CLK
INP
INTERFACE
PIPELINE ADC
REF SYSTEM +
BIAS
OUTPUT
DRIVERS
REF
REFIN REFP CML REFN OE/PD
AV
DD
AGND
DV DD
DGND
D9–D0
INN
T/H
MAX1425
Functional Diagram
19-1597; Rev 0; 1/00
Pin Configuration
Ordering Information
PART
MAX1425CAI
MAX1425EAI -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
28 SSOP
28 SSOP