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MAX1225

Description
1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs
File Size1024KB,18 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1225 Overview

1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs

19-3271; Rev 1; 4/09
1.5Msps, Single-Supply, Low-Power,
True-Differential, 12-Bit ADCs
General Description
The MAX1224/MAX1225 low-power, high-speed, serial-
output, 12-bit, analog-to-digital converters (ADCs) oper-
ate at up to 1.5Msps. These devices feature true-differen-
tial inputs, offering better 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 MAX1224/MAX1225 operate from a single +2.7V to
+3.6V supply voltage and require an external reference.
The MAX1224 has a unipolar analog input, while the
MAX1225 has a bipolar analog input. These devices fea-
ture a partial power-down mode and a full power-down
mode for use between conversions, which lower the sup-
ply current to 1mA (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, good AC
performance, and DC accuracy (±1.5 LSB INL) make the
MAX1224/MAX1225 ideal for industrial process control,
motor control, and base-station applications.
The MAX1224/MAX1225 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
o
1.5Msps Sampling Rate
o
Only 18mW (typ) Power Dissipation
o
Only 1µA (max) Shutdown Current
o
High-Speed, SPI-Compatible, 3-Wire Serial Interface
o
69dB S/(N + D) at 525kHz Input Frequency
o
Internal True-Differential Track/Hold (T/H)
o
External Reference
o
No Pipeline Delays
o
Small 12-Pin TQFN Package
Features
MAX1224/MAX1225
Ordering Information
PART
MAX1224ETC+T
MAX1225ETC+T
TEMP RANGE
PIN-
PACKAGE
INPUT
Unipolar
Bipolar
Applications
Data Acquisition
Bill Validation
Motor Control
Communications
Portable Instruments
-40°C to +85°C 12 TQFN
-40°C to +85°C 12 TQFN
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration
TOP VIEW
AIN+
12
N.C.
11
SCLK
10
10μF
+2.7V TO +3.6V
Typical Operating Circuit
+1.8V TO V
DD
0.01μF
V
DD
0.01μF
V
L
DOUT
10μF
AIN-
REF
RGND
1
2
3
9
8
7
CNVST
DOUT
V
L
DIFFERENTIAL +
INPUT
VOLTAGE -
AIN+
AIN-
MAX1224
MAX1225
MAX1224
MAX1225
REF
4.7μF
0.01μF
REF
RGND
μC/DSP
CNVST
SCLK
4
V
DD
5
N.C.
6
GND
GND
TQFN
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.

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