Datasheet

MAX187/MAX189
+5V, Low-Power, 12-Bit Serial ADCs
2Maxim Integrated
V
DD
to GND .............................................................-0.3V to +6V
AIN to GND................................................-0.3V to (V
DD
+ 0.3V)
REF 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
DD
+ 0.3V)
SHDN to GND.............................................-0.3V to (V
DD
+ 0.3V)
REF Load Current (MAX187) .........................4.0mA Continuous
REF Short-Circuit Duration (MAX187)......................... ... .......20s
DOUT Current..................................................................Q20mA
Continuous Power Dissipation (T
A
= +70NC)
8-Pin PDIP (derate 9.1mW/NC above +70NC)..............727mW
16-Pin Wide SO (derate 14.5mW/NC above 70NC).....1157mW
Operating Temperature Ranges
MAX187_C_ _/MAX189_C_ _..............................0NC to +70NC
MAX187_E_ _/MAX189_E_ _...........................-40NC to +85NC
Storage Temperature Range.............................-60NC to +150NC
Lead Temperature (soldering, 10s) .................................+300NC
Soldering Temperature (reflow) .......................................+260NC
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 opera-
tion 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
GND
= 0V; unipolar input mode; 75ksps, f
CLK
= 4.0MHz, external clock (50% duty cycle); MAX187—internal refer-
ence: V
REF
= 4.096V, 4.7µF capacitor at REF pin, or MAX189—external reference: V
REF
= 4.096V applied to REF pin, 4.7µF capacitor
at REF pin; T
A
= T
MIN
to T
MAX
; unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC ACCURACY (Note 1)
Resolution 12 Bits
Relative Accuracy (Note 2)
MAX18_A
Q½
LSBMAX18_B
Q1
MAX18_C
Q2
Differential Nonlinearity
DNL
No missing codes over temperature
Q1
LSB
Offset Error
MAX18_A
Q1½
LSB
MAX18_B/C
Q3
Gain Error (Note 3)
MAX187
Q3
LSBMAX189A
Q1
MAX189B/C
Q3
Gain Temperature Coefficient External reference, 4.096V
Q0.8 ppm/NC
DYNAMIC SPECIFICATIONS (10kHz Sine Wave Input, 0 to 4.096V
P-P
, 75ksps)
Signal-to-Noise Plus
Distortion Ratio
SINAD
70 dB
Total Harmonic Distortion
(Up to the 5
th
Harmonic)
THD
-80 dB
Spurious-Free Dynamic Range
SFDR
80 dB
Small-Signal Bandwidth Rolloff -3dB 4.5 MHz
Full-Power Bandwidth 0.8 MHz
CONVERSION RATE
Conversion Time t
CONV
5.5 8.5
Fs
Track/Hold Acquisition Time t
ACQ
1.5
Fs
Throughput Rate External clock, 4MHz, 13 clocks 75 ksps