MAX11902 Datasheet, PDF (12/29 Pages) Maxim Integrated Products – Fully Differential SAR ADC

MAX11902
Pin Configuration
18-Bit, 1Msps, Low-Power,
Fully Differential SAR ADC
TOP VIEW
20 19 18 17 16
REF 1
REF 2
REFGND ³
REFGND 4
AIN- 5
MAX11902
6 7 8 9 10
15 DGND
14 DIN
13 CNVST
12 SCLK
DVDD
TQFN
4mm × 4mm
EXPOSED PAD IS GROUND. IT MUST BE SOLDERED TO PCB.
Pin Description
PIN
NAME
I/O
1, 2
REF
I/O
3, 4 REFGND
I
5
AIN-
I
6
AIN+
I
7
AGND
I
8
OVDD
I
9
DOUT
O
10
DGND
I
11
DVDD
I
12
SCLK
I
13
CNVST
I
14
DIN
I
15
DGND
I
FUNCTION
Reference. REF is a bypass pin for the reference either driven by the internal reference buffers
or the external reference directly. Bypass these pins with 10µF capacitors to REFGND.
Reference Ground
Negative Analog Input
Positive Analog Input
Analog Ground
Digital Interface Supply. Nominally at 1.8V. Bypass to DGND with a 10µF capacitor in parallel
with a 0.1µF capacitor (10µF || 0.1µF).
Digital Output Data
Digital Ground
Digital Supply. Nominally at 1.8V. Bypass with a 10µF capacitor in parallel with a 0.1µF
capacitor (10µF || 0.1µF).
Serial Clock Input
Conversion Start. The analog inputs (AIN+, AIN-) are sampled at the rising edge and conversion
process is started.
Serial Data Input. DIN data is latched into the serial interface on the rising edge of SCLK.
Digital Ground
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