DDC112 Datasheet, PDF (19/24 Pages) Burr-Brown (TI) – Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER

Sensor “F”
Sensor “E” Sensor “D”
Sensor “C” Sensor “B”
Sensor “A”
Data Retrievel
Inputs
IN1
IN2
DDC112
DCLK
DXMIT
DVALID
DIN
“F” “E” ^DOUT
40 Bits
IN1
IN2
DDC112
DCLK
DXMIT
R_P
DVALID
DIN
“D” “C” ^DOUT
40 Bits
IN1
IN2
DDC112
DCLK
DXMIT
R_P
DVALID
DIN
“B” “A” ^DOUT
40 Bits
R_P Data Retrieval
Outputs
FIGURE 20. Daisy-Chained DDC112’s.
DDC112
DIN
DOUT
DXMIT
DDC112
DIN
DOUT
DXMIT
DDC112
DIN
DOUT
DXMIT
FIGURE 21. DDC112 in Parallel Operation.
Data Output
Enable
CLK
t₁₈
DVALID
t₁₉
DXMIT
t₂₀
DCLK⁽¹⁾
t₂₁
t₂₂
DOUT
Output Disabled
Input 2
Bit 1
MSB
Output Enabled
Input 2
Bit 20
LSB
Input 1
Bit 1
MSB
NOTE: (1) Disable DCLK (preferably hold LOW) when DXMIT is HIGH.
t₂₃
Input 1
Bit 20
LSB
Output Disabled
FIGURE 22. Digital Interface Timing Diagram for Data Retrieval From a Single DDC112.
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t₁₈
t₁₉
t₂₀
t₂₁
t₂₂
t₂₃
t_22A(1)
t_22B(2)
Propagation Delay from Rising Edge of CLK to DVALID LOW
Propagation Delay from DXMIT LOW to DVALID HIGH
Setup Time from DCLK LOW TO DXMIT LOW
Propagation Delay from DXMIT LOW to Valid DOUT
Hold Time that DOUT is Valid After Falling Edge of DCLK
Propagation Delay from DXMIT HIGH to DOUT Disabled
Propagaton Delay from Falling Edge of DCLK to Valid DOUT
Propagation Delay from Falling Edge of DCLK to Valid DOUT
30
ns
30
ns
20
ns
30
ns
5
ns
30
ns
25
ns
30
ns
NOTES: (1) Applies to DDC112UK only, with a maximum load of one DDC112UK DIN (4pF typical) with an additional load of (5pF 100kΩ). (2) Applies to
DDC112U only, with a maximum load of one DDC112U DIN (4pF typical) with an additional load of (5pF 100kΩ).
TABLE IX. Timing for the DDC112 Data Retrieval.
19
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DDC112