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1999 Feb 16 10
Philips Semiconductors Preliminary specification
12-bit high-speed Analog-to-Digital
Converter (ADC)
TDA8767
Table 1 Output coding with differential inputs (typical values to AGND); V
I(p-p)
− V
I(p-p)
= 2.0 V; V
ref
=V
CCA
− 2V
Table 2 Output coding with single input (typical values to AGND); V
FS
= 2.0 V (p-p); V
ref
=V
CCA
− 2V
Table 3 Mode selection
Note
1. Where: X = don’t care.
Table 4 Sample-and-hold selection
CODE V
I
V
I
IR
BINARY OUTPUTS
TWO’S COMPLEMENT
OUTPUTS
D11 to D0 D11 to D0
underflow <2.0 >3.0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
0 2.0 3.0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
1 −−1 0 0 0 0 0 0 0 0 0 0 01 1 0 0 0 0 0 0 0 0 0 0 1
↓−−↓ ↓ ↓
2047 2.5 2.5 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
↓−−↓ ↓ ↓
4094 −−1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 0
4095 3.0 2.0 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1
overflow >3.0 <2.0 0 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1
CODE V
I
IR
BINARY OUTPUTS
TWO’S COMPLEMENT
OUTPUTS
D11 to D0 D11 to D0
underflow <1.5 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
0 1.5 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
1 − 1 0 0 0 0 0 0 0 0 0 0 01 1 0 0 0 0 0 0 0 0 0 0 1
↓−↓ ↓ ↓
2047 2.5 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
↓−↓ ↓ ↓
4094 − 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 0
4095 3.5 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1
overflow >3.5 0 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1
TC OE D0 to D11 and IR
0 0 binary; active
1 0 two’s complement; active
X
(1)
1 high impedance
SH SAMPLE-AND-HOLD
1 active
0 inactive; tracking mode