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| MAX1224 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – 1.5Msps, Single-Supply, Low-Power, True-Differential, 12-Bit ADCs | |||
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19-3271; Rev 0; 5/04
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 SPIâ¢/QSPIâ¢/MICROWIREâ¢
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 (VL), which
allows direct interfacing to +1.8V to VDD 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 commercial (0°C to +70°C)
and extended (-40°C to +85°C) temperature ranges.
Data Acquisition
Bill Validation
Motor Control
Applications
Communications
Portable Instruments
Pin Configuration
Features
⦠1.5Msps Sampling Rate
⦠Only 18mW (typ) Power Dissipation
⦠Only 1µA (max) Shutdown Current
⦠High-Speed, SPI-Compatible, 3-Wire Serial Interface
⦠69dB S/(N + D) at 525kHz Input Frequency
⦠Internal True-Differential Track/Hold (T/H)
⦠External Reference
⦠No Pipeline Delays
⦠Small 12-Pin TQFN Package
Ordering Information
PART
MAX1224CTC-T
MAX1224ETC-T
MAX1225CTC-T
MAX1225ETC-T
TEMP RANGE
PIN-
PACKAGE
0°C to +70°C 12 TQFN-12
-40°C to +85°C 12 TQFN-12
0°C to +70°C 12 TQFN-12
-40°C to +85°C 12 TQFN-12
INPUT
Unipolar
Unipolar
Bipolar
Bipolar
Typical Operating Circuit
TOP VIEW
AIN+ N.C. SCLK
12 11 10
AIN- 1
REF 2
RGND 3
MAX1224
MAX1225
9 CNVST
8 DOUT
7 VL
4
5
6
VDD N.C. GND
TQFN
+2.7V TO +3.6V
+1.8V TO VDD
10µF
DIFFERENTIAL +
INPUT
VOLTAGE -
REF
4.7µF
0.01µF
0.01µF
VDD
0.01µF
VL
AIN+
DOUT
AIN-
MAX1224
MAX1225 CNVST
SCLK
REF
RGND
GND
10µF
µC/DSP
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/Dallas Direct! at
1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.
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