MAX1204
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-inter-
face clock to perform successive-approximation ana-
log-to-digital conversions. The serial interface operates
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 V
L
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 PDIP
packages, and is specified for the commercial and
extended 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 PDIP/SSOP
o
Pin-Compatible 12-Bit Upgrade: MAX1202
______________Ordering Information
PART
MAX1204ACPP+
MAX1204BCPP+
MAX1204ACAP+
MAX1204BCAP+
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
20 PDIP
20 PDIP
20 SSOP
20 SSOP
TOP
MARK
±1/2
±1
±1/2
±1
Ordering Information continued at end of data sheet.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
__________________Pin Configuration
TOP VIEW
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
V
SS
1
2
3
4
5
6
7
8
9
________________________Applications
5V/3V Mixed-Supply Systems
Data Acquisition
Process Control
Battery-Powered Instruments
Medical Instruments
+
20 V
DD
19 SCLK
18 CS
MAX1204
17 DIN
16 SSTRB
15 DOUT
14 VL
13 GND
12 REFADJ
11 REF
SHDN 10
Typical Operating Circuit appears on last page.
MICROWIRE is a registered trademark of National Semiconductor Corp.
PDIP/SSOP
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1179; Rev 1; 1/12
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ..............................................................-0.3V to +6V
V
L
................................................................-0.3V to (V
DD
+ 0.3V)
V
SS
to GND...............................................................+0.3V to -6V
V
DD
to V
SS
..............................................................-0.3V to +12V
CH0–CH7 to GND ............................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
CH0–CH7 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 (V
L
+ 0.3V)
Digital Output Sink Current .................................................25mA
Continuous Power Dissipation (T
A
= +70°C)
PDIP (derate 11.11mW/°C above +70°C) .....................889mW
SSOP (derate 8.00mW/°C above +70°C) .....................640mW
Operating Temperature Ranges
MAX1204_C_P .....................................................0°C to +70°C
MAX1204_E_P ..................................................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Soldering Temperature (reflow) .......................................+260°C
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.
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V ±5%, V
L
= 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.)
PARAMETER
DC ACCURACY
(Note 1)
Resolution
Relative Accuracy (Note 2)
Differential Nonlinearity
Offset Error
Gain Error (Note 3)
Gain Temperature Coefficient
Channel-to-Channel
Offset Matching
Signal-to-Noise + Distortion Ratio
Total Harmonic Distortion
(up to the 5th harmonic)
Spurious-Free Dynamic Range
Channel-to-Channel Crosstalk
Small-Signal Bandwidth
Full-Power Bandwidth
SINAD
THD
SFDR
V
IN
= 4.096V
P-P
, 65kHz (Note 4)
-3dB rolloff
INL
DNL
MAX1204A
MAX1204B
No missing codes over temperature
MAX1204A
MAX1204B
MAX1204A
MAX1204B
External reference, 4.096V
±0.8
±0.1
10
±0.5
±1.0
±1.0
±1.0
±2.0
±1.0
±2.0
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC SPECIFICATIONS
(10kHz sine-wave input, 4.096V
P-P
, 133ksps, 2.0MHz external clock, bipolar input mode)
66
-70
70
-75
4.5
800
dB
dB
dB
dB
MHz
kHz
2
Maxim Integrated
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +5V ±5%, V
L
= 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.)
PARAMETER
CONVERSION RATE
Conversion Time (Note 5)
Track/Hold Acquisition Time
Aperture Delay
Aperture Jitter
Internal Clock Frequency
External compensation mode, 4.7µF
External Clock-Frequency Range
ANALOG INPUT
Input Voltage Range, Single-
Ended and Differential (Note 7)
Multiplexer Leakage Current
Input Capacitance
INTERNAL REFERENCE
REF Output Voltage
REF Short-Circuit Current
MAX1204AC
V
REF
Temperature Coefficient
Load Regulation (Note 8)
Capacitive Bypass at REF
Capacitive Bypass at REFADJ
REFADJ Adjustment Range
EXTERNAL REFERENCE AT REF
(Buffer disabled, V
REF
= 4.096V)
Input Voltage Range
Input Current
Input Resistance
REF Input Current in Shutdown
REFADJ Buffer Disable Threshold
V
SHDN
= 0V
V
DD
-
50mV
12
2.50
200
20
1.5
10
V
DD
+
50mV
350
V
µA
kΩ
µA
V
MAX1204AE
MAX1204B
0mA to 0.5mA output load
Internal compensation mode
External compensation mode
0
4.7
0.01
±1.5
±30
±30
±30
2.5
mV
µF
µF
%
T
A
= +25°C
4.076
4.096
4.116
30
±50
±60
ppm/°C
V
mA
Unipolar, V
SS
= 0V
Bipolar, V
SS
= -5V
On/off leakage current, V
CH_
= ±5V
(Note 6)
±0.01
16
V
REF
±V
REF
/ 2
±1
V
µA
pF
Internal compensation mode (Note 6)
Used for data transfer only
0.1
0.1
0
t
CONV
t
ACQ
Internal clock
External clock, 2MHz, 12 clocks/conversion
5.5
6
1.5
10
<50
1.7
2.0
0.4
2.0
MHz
10
µs
µs
ns
ps
MHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maxim Integrated
3
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
ELECTRICAL CHARACTERISTICS (continued)
V
DD
= +5V ±5%, V
L
= 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.)
PARAMETER
SYMBOL
CONDITIONS
Internal compensation mode
External compensation mode
MIN
0
4.7
1.68
±50
V
DD
V
SS
Operating mode
Positive Supply Current
I
DD
Fast power-down (Note 9)
Full power-down (Note 9)
Negative Supply Current
Logic Supply Voltage
Logic Supply Current (Notes 6, 10)
Positive Supply Rejection
(Note 11)
Negative Supply Rejection
(Note 11)
Logic Supply Rejection
(Note 12)
I
SS
V
L
I
VL
PSR
PSR
PSR
V
L
= V
DD
= 5V
V
DD
= 5V ±5%; external reference, 4.096V;
full-scale input
V
SS
= -5V ±5%; external reference, 4.096V;
full-scale input
External reference, 4.096V; full-scale input
±0.06
±0.01
±0.06
Operating mode and fast power-down
Full power-down
2.70
5 ±5%
0 or -5 ±5%
1.5
30
2
2.5
70
10
50
10
5.25
10
±0.5
±0.5
±0.5
TYP
MAX
UNITS
EXTERNAL REFERENCE AT REFADJ
Capacitive Bypass at REF
Reference-Buffer Gain
REFADJ Input Current
POWER REQUIREMENTS
Positive Supply Voltage
Negative Supply Voltage
µF
V/V
µA
µA
V
V
mA
µA
µA
V
µA
mV
mV
mV
4
Maxim Integrated
MAX1204
5V, 8-Channel, Serial, 10-Bit ADC
with 3V Digital Interface
ELECTRICAL CHARACTERISTICS
(V
DD
= +5V ±5%, V
L
= 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.)
PARAMETER
DIN, SCLK,
CS
Input High Voltage
DIN, SCLK,
CS
Input Low Voltage
DIN, SCLK,
CS
Input Hysteresis
DIN, SCLK,
CS
Input Leakage
DIN, SCLK,
CS
Input Capacitance
SHDN
Input High Voltage
SHDN
Input Mid-Voltage
SHDN
Voltage, Open
SHDN
Input Low Voltage
SHDN
Input Current, High
SHDN
Input Current, Low
SHDN
Maximum Allowed
Leakage, Mid-Input
SYMBOL
V
IH
V
IL
V
HYST
I
IN
C
IN
V
SH
V
SM
V
FLT
V
SL
I
SH
I
SL
SHDN
= V
DD
V
SHDN
= 0V
SHDN
= open
-4.0
-100
100
SHDN
= open
V
IN
= 0V or V
DD
(Note 6)
V
DD
- 0.5
1.5
2.75
0.5
4.0
V
DD
- 1.5
0.15
±1
15
CONDITIONS
MIN
2.0
0.8
TYP
MAX
UNITS
V
V
V
µA
pF
V
V
V
V
µA
µA
nA
DIGITAL INPUTS: DIN, SCLK,
CS, SHDN
DIGITAL OUTPUTS: DOUT, SSTRB
(V
L
= 2.7V to 3.6V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
L
C
OUT
I
SINK
= 3mA
I
SINK
= 6mA
I
SOURCE
= 1mA
CS
= V
L
CS
= V
L
(Note 6)
I
SINK
= 5mA
I
SINK
= 8mA
I
SOURCE
= 1mA
V
CS
= 5V
V
CS
= 5V (Note 6)
4
±10
15
0.3
V
L
- 0.5
±10
15
0.4
0.3
0.4
V
V
µA
pF
DIGITAL OUTPUTS: DOUT, SSTRB
(V
L
= 4.75V to 5.25V)
Output Voltage Low
Output Voltage High
Three-State Leakage Current
Three-State Output Capacitance
V
OL
V
OH
I
L
C
OUT
V
V
µA
pF
Maxim Integrated
5
Microchip MCU
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