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Part Number MAX1204

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_______________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
SPITM/MicrowireTM 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.
________________________Applications
5V/3V Mixed-Supply Systems
Data Acquisition
Process Control
Battery-Powered Instruments
Medical Instruments
____________________________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
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
________________________________________________________________
Maxim Integrated Products
1
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
TOP VIEW
DIP/SSOP
V
DD
SCLK
CS
DIN
SSTRB
DOUT
VL
GND
REFADJ
REF
SHDN
V
SS
CH7
CH6
CH5
CH4
CH3
CH2
CH1
CH0
MAX1204
__________________Pin Configuration
19-1179; Rev 0; 1/97
______________Ordering Information
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Typical Operating Circuit appears on last page.
SPI is a registered trademark of Motorola, Inc.
Microwire is a registered trademark of National Semiconductor Corp.
Ordering Information continued at end of data sheet.
PART
MAX1204ACPP
MAX1204BCPP
MAX1204ACAP
0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
20 Plastic DIP
20 Plastic DIP
20 SSOP
MAX1204BCAP
0°C to +70°C
20 SSOP
INL
(LSB)
±1/2
±1
±1/2
±1
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V
DD
to GND ..............................................................-0.3V to +6V
VL ...............................................................-0.3V to (V
DD
+ 0.3V)
V
SS
to GND...............................................................+0.3V to -6V
V
DD
to V
SS
..............................................................-0.3V to +12V
CH0­CH7 to GND ............................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
CH0­CH7 Total Input Current...........................................±20mA
REF to GND ................................................-0.3V to (V
DD
+ 0.3V)
REFADJ to GND .........................................-0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND .................................-0.3V to (V
DD
+ 0.3V)
Digital Outputs to GND .................................-0.3V to (VL + 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 11.11mW/°C above +70°C) ...........889mW
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
CERDIP (derate 11.11mW°C above +70°C) .................889mW
Operating Temperature Ranges
MAX1204_C_P .....................................................0°C to +70°C
MAX1204_E_P ..................................................-40°C to +85°C
MAX1204BMJP ...............................................-55°C to +125°C
Storage Temperature Range .............................-60°C to +150°C
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V ±5%, VL = 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); 4.7µF capacitor at REF; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
MAX1204A
V
IN
= 4.096Vp-p, 65kHz (Note 4)
External reference, 4.096V
MAX1204B
No missing codes over temperature
MAX1204A
MAX1204B
CONDITIONS
dB
-75
Channel-to-Channel Crosstalk
dB
70
SFDR
Spurious-Free Dynamic Range
dB
-70
THD
Total Harmonic Distortion
(up to the 5th harmonic)
dB
66
SINAD
Signal-to-Noise + Distortion Ratio
LSB
±0.5
INL
Relative Accuracy (Note 2)
Bits
10
Resolution
LSB
±0.1
Channel-to-Channel
Offset Matching
ppm/°C
±0.8
Gain Temperature Coefficient
±1.0
LSB
±1.0
DNL
Differential Nonlinearity
LSB
±1.0
Offset Error
±2.0
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
-3dB rolloff
MHz
4.5
Small-Signal Bandwidth
kHz
800
Full-Power Bandwidth
LSB
±1.0
Gain Error (Note 3)
±2.0
MAX1204A
MAX1204B
DC ACCURACY
(Note 1)
DYNAMIC SPECIFICATIONS
(10kHz sine-wave input, 4.096Vp-p, 133ksps, 2.0MHz external clock, bipolar input mode)
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, VL = 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); 4.7µF capacitor at REF; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
MAX1204AC
T
A
= +25°C
External clock, 2MHz, 12 clocks/conversion
(Note 6)
On/off leakage current, V
CH_
= ±5V
Bipolar, V
SS
= -5V
Unipolar, V
SS
= 0V
6
Used for data transfer only
Internal compensation mode (Note 6)
Internal clock
External compensation mode, 4.7µF
CONDITIONS
ppm/°C
±30
±50
V
REF
Temperature Coefficient
mA
30
REF Short-Circuit Current
V
4.076
4.096
4.116
REF Output Voltage
pF
16
Input Capacitance
µA
±0.01
±1
Multiplexer Leakage Current
±V
REF
/ 2
V
V
REF
Input Voltage Range, Single-
Ended and Differential (Note 7)
0
2.0
0.1
0.4
MHz
0.1
2.0
External Clock-Frequency Range
MHz
1.7
Internal Clock Frequency
ns
10
Aperture Delay
µs
1.5
t
ACQ
Track/Hold Acquisition Time
µs
5.5
10
t
CONV
Conversion Time (Note 5)
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
MAX1204AE
±30
±60
±30
MAX1204B
0mA to 0.5mA output load
mV
2.5
Load Regulation (Note 8)
Internal compensation mode
µF
0
Capacitive Bypass at REF
External compensation mode
4.7
µF
0.01
Capacitive Bypass at REFADJ
%
±1.5
REFADJ Adjustment Range
V
2.50
V
DD
+
50mV
Input Voltage Range
µA
200
350
Input Current
k
12
20
Input Resistance
SHDN = 0V
µA
1.5
10
REF Input Current in Shutdown
V
V
DD
-
50mV
REFADJ Buffer Disable Threshold
ps
<50
Aperture Jitter
CONVERSION RATE
INTERNAL REFERENCE
ANALOG INPUT
EXTERNAL REFERENCE AT REF
(Buffer disabled, V
REF
= 4.096V)
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
4
_______________________________________________________________________________________
Internal compensation mode
Fast power-down (Note 9)
External compensation mode
CONDITIONS
µF
0
Capacitive Bypass at REF
µA
30
70
I
DD
Positive Supply Current
V
0 or -5 ±5%
V
SS
Negative Supply Voltage
V
5 ±5%
V
DD
Positive Supply Voltage
4.7
V/V
1.68
Reference-Buffer Gain
µA
±50
REFADJ Input Current
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
ELECTRICAL CHARACTERISTICS (continued)
V
DD
= +5V ±5%, VL = 2.7V to 3.6V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); 4.7µF capacitor at REF; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
Operating mode
mA
1.5
2.5
Operating mode and fast power-down
µA
50
I
SS
Negative Supply Current
Full power-down (Note 9)
2
10
Full power-down
10
V
2.70
5.25
VL
Logic Supply Voltage
VL = V
DD
= 5V
µA
10
I
VL
Logic Supply Current (Notes 6, 10)
V
DD
= 5V ±5%; external reference, 4.096V;
full-scale input
mV
±0.06
±0.5
PSR
Positive Supply Rejection
(Note 11)
V
SS
= -5V ±5%; external reference, 4.096V;
full-scale input
mV
±0.01
±0.5
PSR
Negative Supply Rejection
(Note 11)
External reference, 4.096V; full-scale input
mV
±0.06
±0.5
PSR
Logic Supply Rejection
(Note 12)
µA
EXTERNAL REFERENCE AT REFADJ
POWER REQUIREMENTS
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
_______________________________________________________________________________________
5
CS = VL (Note 6)
CS = VL
I
SOURCE
= 1mA
I
SINK
= 3mA
SHDN = open
SHDN = 0V
SHDN = V
DD
(Note 6)
V
IN
= 0V or V
DD
CONDITIONS
pF
15
C
OUT
Three-State Output Capacitance
µA
±10
I
L
Three-State Leakage Current
V
VL - 0.5
V
OH
Output Voltage High
V
0.4
V
OL
Output Voltage Low
nA
-100
100
SHDN Maximum Allowed
Leakage, Mid-Input
µA
-4.0
I
SL
SHDN Input Current, Low
µA
4.0
I
SH
SHDN Input Current, High
V
V
DD
- 0.5
V
SH
SHDN Input High Voltage
V
0.8
V
IL
V
2.0
V
IH
DIN, SCLK,
CS Input High Voltage
DIN, SCLK,
CS Input Low Voltage
pF
15
C
IN
DIN, SCLK,
CS Input Capacitance
µA
±1
I
IN
DIN, SCLK,
CS Input Leakage
V
0.15
V
HYST
DIN, SCLK,
CS Input Hysteresis
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V ±5%, VL = 2.7V to 5.25V; V
SS
= 0V or -5V ±5%; f
SCLK
= 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); 4.7µF capacitor at REF; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
I
SINK
= 5mA
V
0.4
V
OL
Output Voltage Low
I
SINK
= 8mA
0.3
I
SINK
= 6mA
0.3
I
SOURCE
= 1mA
V
4
V
OH
Output Voltage High
CS = 5V
µA
±10
I
L
Three-State Leakage Current
CS = 5V (Note 6)
pF
15
C
OUT
Three-State Output Capacitance
V
1.5
V
DD
- 1.5
V
SM
SHDN Input Mid-Voltage
V
0.5
V
SL
SHDN Input Low Voltage
SHDN = open
V
2.75
V
FLT
SHDN Voltage, Floating
DIGITAL INPUTS: DIN, SCLK,
CS, SHDN
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 2.7V to 3.6V)
DIGITAL OUTPUTS: DOUT, SSTRB
(VL = 4.75V to 5.25V)