MAX1225 Maxim Integrated Products, MAX1225 Datasheet
MAX1225
Manufacturer Part Number
MAX1225
Description
(MAX1224 / MAX1225) 12-Bit ADCs
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1225.pdf
(18 pages)
www.DataSheet4U.com
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
allows direct interfacing to +1.8V to V
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.
19-3271; Rev 0; 5/04
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
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.
TOP VIEW
Data Acquisition
Bill Validation
Motor Control
RGND
AIN-
REF
1
2
3
________________________________________________________________ Maxim Integrated Products
V
AIN+
12
4
DD
General Description
MAX1224
MAX1225
TQFN
Pin Configuration
N.C.
N.C.
11
5
1.5Msps, Single-Supply, Low-Power,
Communications
Portable Instruments
SCLK
GND
10
6
Applications
DD
digital logic. The
9
8
7
CNVST
DOUT
V
L
True-Differential, 12-Bit ADCs
L
), which
MAX1224CTC-T
MAX1224ETC-T
MAX1225CTC-T
MAX1225ETC-T
+2.7V TO +3.6V
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
REF
4.7µF
DIFFERENTIAL
10µF
PART
VOLTAGE
INPUT
0.01µF
+
-
Typical Operating Circuit
0.01µF
-40 C to +85 C 12 TQFN-12
-40 C to +85 C 12 TQFN-12
TEMP RANGE
0 C to +70 C
0 C to +70 C
AIN+
REF
AIN-
RGND
V
Ordering Information
DD
MAX1224
MAX1225
+1.8V TO V
GND
V
CNVST
L
0.01µF
DOUT
SCLK
PIN-
PACKAGE
12 TQFN-12
12 TQFN-12
DD
Features
10µF
µC/DSP
Unipolar
Unipolar
Bipolar
Bipolar
INPUT
1
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