Datasheet
MAX1178/MAX1188
16-Bit, 135ksps, Single-Supply ADCs with
Bipolar Analog Input Range
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Typical Operating Circuit, AV
DD
= DV
DD
= +5V, external reference = +4.096V, C
REF
= 10µF, C
REFADJ
= 0.1µF, V
REFADJ
= AV
DD
,
C
LOAD
= 20pF. Typical values are at T
A
= +25°C, unless otherwise noted.)
SINAD vs. FREQUENCY
MAX1178/88 toc10
FREQUENCY (kHz)
SINAD (dB)
10
10
20
30
40
50
60
70
80
90
100
0
1100
f
SAMPLE
= 131ksps
SFDR vs. FREQUENCY
MAX1178/88 toc11
FREQUENCY (kHz)
SFDR (dB)
10
20
40
60
80
100
120
0
1100
f
SAMPLE
= 131ksps
THD vs. FREQUENCY
MAX1178/88 toc12
FREQUENCY (kHz)
THD (dB)
10
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-110
1100
f
SAMPLE
= 131ksps
Pin Description
PIN NAME FUNCTION
1 D4/D12 Tri-State Digital-Data Output
2 D5/D13 Tri-State Digital-Data Output
3 D6/D14 Tri-State Digital-Data Output
4 D7/D15 Tri-State Digital-Data Output. D15 is the MSB.
5R/C
Read/Convert Input. Power up and put the MAX1178/MAX1188 in acquisition mode by holding R/C
low during the first falling edge of CS. During the second falling edge of CS, the level on R/C
determines whether the reference and reference buffer power down or remain on after conversion.
Set R/C high during the second falling edge of CS to power down the reference and buffer, or set R/C
low to leave the reference and buffer powered up. Set R/C high during the third falling edge of CS to
put valid data on the bus.
6 EOC End of Conversion. EOC drives low when conversion is complete.
7AV
DD
Analog Supply Input. Bypass with a 0.1µF capacitor to AGND.
8 AGND Analog Ground. Primary analog ground (star ground).
9 AIN Analog Input
10 AGND Analog Ground. Connect pin 10 to pin 8.
11 REFADJ
Reference Buffer Output. Bypass REFADJ with a 0.1µF capacitor to AGND for internal reference
mode. Connect REFADJ to AV
DD
to select external reference mode.
12 REF
Reference Input/Output. Bypass REF with a 10µF capacitor to AGND for internal reference mode.
External reference input when in external reference mode.