DDC112Y Datasheet, PDF (4/34 Pages) Texas Instruments – Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER

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