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DDC112_14 Datasheet, PDF (5/35 Pages) Texas Instruments – Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER
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PIN CONFIGURATION
Top View
CAP1A 1
CAP1A 2
AVDD 3
NC 4
NC 5
TEST 6
CONV 7
CLK 8
DDC112Y
24 CAP2A
23 CAP2A
22 VREF
21 AGND
20 NC
19 NC
18 RANGE2 (MSB)
17 RANGE1
TQFP
PIN DESCRIPTIONS
PIN LABEL DESCRIPTION
1
CAP1A External Capacitor for Integrator 1A
2
CAP1A External Capacitor for Integrator 1A
3
AVDD Analog Supply, +5V Nominal
4
NC No Connection
5
NC No Connection
6
TEST Test Control Input. When HIGH, a test charge is
applied to the A or B integrators on the next CONV
transition.
7
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 text).
8
CLK System Clock Input, 10MHz Nominal
9
DCLK Serial Data Clock Input. This input operates the
serial I/O shift register.
10
DXMIT Serial Data Transmit Enable Input. When LOW, this
input enables the internal serial shift register.
11
DIN Serial Digital Input. Used to cascade multiple
DDC112s.
12
DVDD Digital Supply, +5V Nominal
13
DGND Digital Ground
14
DOUT Serial Data Output, Hi-Z when DXMIT is HIGH
PIN LABEL DESCRIPTION
15 DVALID Data Valid Output. A LOW value indicates valid data is
available in the serial I/O register.
16 RANGE0 Range Control Input 0 (least significant bit)
17 RANGE1 Range Control Input 1
18 RANGE2 Range Control Input 2. (most significant bit)
19
NC
No Connection
20
NC
No Connection
21
AGND Analog Ground
22
VREF 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.
29
IN1 Input 1: analog input for Integrators 1A and 1B. The
integrator that is active is set by the CONV input.
30
AGND Analog Ground
31
CAP1B External Capacitor for Integrator 1B
32
CAP1B External Capacitor for Integrator 1B
DDC112
5
SBAS085B
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