MAX1204 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 5v, 8-cHANNEL, sERIAL, 10-bIT adc WITH 3v dIGITAL iNTERFACE

19-1179; Rev 0; 1/97
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
_______________General Description
The MAX1204 is a 10-bit data-acquisition system
specifically designed for use in applications with mixed
+5V (analog) and +3V (digital) supply voltages. It oper-
ates with a single +5V analog supply or dual ±5V ana-
log supplies, and combines an 8-channel multiplexer,
internal track/hold, and serial interface with high con-
version speed and low power consumption.
A 4-wire serial interface connects directly to
SPI™/Microwire™ devices without external logic, and a
serial strobe output allows direct connection to
TMS320-family digital signal processors. The MAX1204
uses either the internal clock or an external serial-
interface clock to perform successive-approximation
analog-to-digital conversions. The serial interface oper-
ates at up to 2MHz.
The MAX1204 features an internal 4.096V reference and
a reference-buffer amplifier that simplifies gain trim. It
also has a VL pin that supplies power to the digital out-
puts. Output logic levels (3V, 3.3V, or 5V) are determined
by the value of the voltage applied to this pin.
A hard-wired SHDN pin and two software-selectable
power-down modes are provided. Accessing the serial
interface automatically powers up the device. A quick
turn-on time allows the MAX1204 to be shut down
between conversions, enabling the user to optimize
supply currents. By customizing power-down between
conversions, supply current can drop below 10µA at
reduced sampling rates.
The MAX1204 is available in 20-pin SSOP and DIP
packages, and is specified for the commercial, extend-
ed, and military temperature ranges.
____________________________Features
o 8-Channel Single-Ended or 4-Channel
Differential Inputs
o Operates from +5V Single or ±5V Dual Supplies
o User-Adjustable Output Logic Levels
(2.7V to 5.25V)
o Low Power: 1.5mA (operating mode)
2µA (power-down mode)
o Internal Track/Hold, 133kHz Sampling Rate
o Internal 4.096V Reference
o SPI/Microwire/TMS320-Compatible
4-Wire Serial Interface
o Software-Configurable Unipolar/Bipolar Inputs
o 20-Pin DIP/SSOP
o Pin-Compatible 12-Bit Upgrade: MAX1202
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
INL
(LSB)
MAX1204ACPP 0°C to +70°C 20 Plastic DIP ±1/2
MAX1204BCPP 0°C to +70°C 20 Plastic DIP ±1
MAX1204ACAP 0°C to +70°C 20 SSOP
MAX1204BCAP 0°C to +70°C 20 SSOP
±1/2
±1
Ordering Information continued at end of data sheet.
__________________Pin Configuration
________________________Applications
5V/3V Mixed-Supply Systems
Data Acquisition
Process Control
Battery-Powered Instruments
Medical Instruments
Typical Operating Circuit appears on last page.
SPI is a registered trademark of Motorola, Inc.
Microwire is a registered trademark of National Semiconductor Corp.
TOP VIEW
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
V_SS 9
SHDN 10
MAX1204
20 V_DD
19 SCLK
18 CS
17 DIN
16 SSTRB
15 DOUT
14 VL
13 GND
12 REFADJ
11 REF
DIP/SSOP
________________________________________________________________ Maxim Integrated Products 1
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