TDA8768A Datasheet, PDF (12/32 Pages) NXP Semiconductors – 12-bit, 70 Msps Analog-to-Digital Converter (ADC)

Philips Semiconductors
TDA8768A
12-bit, 70 Msps Analog-to-Digital Converter (ADC)
Table 7:
Code
Output coding with differential inputs (typical values to AGND);
V_i(p-p) − V_i(p-p) = 1.9 V, V_ref = V_CCA3 − 1.75 V
V_i(p-p) V_i(p-p)
IR
Binary outputs
Twos complement
outputs^[1]
D11 to D0
D11 to D0
Underflow <3.125 >4.075 0
000000000000 100000000000
0
3.125 4.075 1
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 00
1
−
−
1
000000000001 100000000001
↓
−
−
↓
↓
↓
2 047
3.6
3.6
1
011111111111 111111111111
↓
−
−
↓
↓
↓
4 094
−
−
1
111111111110 011111111110
4 095
4.075 3.125 1
111111111111 011111111111
Overflow >4.075 <3.125 0
111111111111 011111111111
[1] Twos complement reference is inverted MSB.
Table 8:
OTC
0
1
X^[1]
Mode selection
CE
0
0
1
[1] X = don’t care.
D0 to D11 and IR
binary; active
twos complement; active
high-impedance
Table 9:
SH
1
0
Sample-and-hold selection
Sample-and-hold
active
inactive; tracking mode
tCLKH
tCLKL
CLK
sample N
sample N + 1 sample N + 2
HIGH
50 %
LOW
Vl
DATA
D0 to D11
Fig 3. Timing diagram.
9397 750 09656
Product data
t _ds
DATA
N−2
DATA
N−1
td
th
DATA
N
Rev. 02 — 03 July 2002
DATA
N+1
HIGH
50 %
LOW
MBG855
© Koninklijke Philips Electronics N.V. 2002. All rights reserved.
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