PIN CONFIGURATION
PIN DESCRIPTIONS
PIN
LABEL DESCRIPTION
Top View
SO
1
IN1
Input 1: analog input for Integrators 1A and 1B. The
integrator that is active is set by the CONV input.
2
3
4
5
6
7
8
AGND
CAP1B
CAP1B
CAP1A
CAP1A
AVDD
Analog Ground
External Capacitor for Integrator 1B
External Capacitor for Integrator 1B
External Capacitor for Integrator 1A
External Capacitor for Integrator 1A
Analog Supply, +5V Nominal
TEST
Test Control Input. When HIGH, a test charge is applied
to the A or B integrators on the next CONV transition.
IN1
AGND
CAP1B
CAP1B
CAP1A
CAP1A
AVDD
1
2
3
4
5
6
7
8
9
28 IN2
27 AGND
9
CONV
Controls which side of the integrator is connected to
input. In continuous mode; CONV HIGH → side A is
integrating, CONV LOW → side B is integrating. CONV
must be synchronized with CLK (see Figure 2).
26 CAP2B
25 CAP2B
24 CAP2A
23 CAP2A
22 VREF
10
11
CLK
System Clock Input, 10MHz Nominal
DCLK
Serial Data Clock Input. This input operates the serial I/
O shift register.
12
DXMIT
Serial Data Transmit Enable Input. When LOW, this
input enables the internal serial shift register.
DDC112U
TEST
21 AGND
13
14
15
16
17
DIN
Serial Digital Input. Used to cascade multiple DDC112s.
Digital Supply, +5V Nominal
DVDD
DGND
DOUT
CONV
20 RANGE2 (MSB)
19 RANGE1
18 RANGE0 (LSB)
17 DVALID
16 DOUT
Digital Ground
CLK 10
DCLK 11
DXMIT 12
DIN 13
Serial Data Output, Hi-Z when DXMIT is HIGH
DVALID Data Valid Output. A LOW value indicates valid data is
available in the serial I/O register.
18
19
20
21
22
23
24
25
26
27
28
RANGE0 Range Control Input 0 (least significant bit)
RANGE1 Range Control Input 1
RANGE2 Range Control Input 2 (most significant bit)
DVDD 14
15 DGND
AGND
VREF
Analog Ground
External Reference Input, +4.096V Nominal
External Capacitor for Integrator 2A
External Capacitor for Integrator 2A
External Capacitor for Integrator 2B
External Capacitor for Integrator 2B
Analog Ground
CAP2A
CAP2A
CAP2B
CAP2B
AGND
IN2
Input 2: analog input for Integrators 2A and 2B. The
integrator that is active is set by the CONV input.
DDC112
4
SBAS085B
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