tda8752b-03 NXP Semiconductors, tda8752b-03 Datasheet - Page 18

• Manufacturer Part Number: tda8752b-03
• Description: Tda8752b Triple High-speed Analog-to-digital Converter 110 Msps
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 07338
Product specification
9.1.2 Coarse and fine registers
Table 5:
The default programmed value is:
These two registers enable the gain control, the AGC gain with the coarse register
and the reference voltage with the fine register. The coarse register programming
equation is as follows:
Where: V
The gain correspondence is given in
programming code (N
Table 6:
The default programmed value is as follows:
To modulate this gain, the fine register is programmed using the above equation. With
a full-scale ADC input, the fine register resolution is a
(see
GAIN
Programmed code
0
1
2
...
127
...
254
255
256
...
287
N
32
99
•
•
•
•
•
•
COARSE
Programmed code = 127
Clamp code = 0
ADC output = 0.
N
Gain = 0.825
V
i
COARSE
Table 7
to be full-scale = 1.212 V.
=
ref
----------------------------------------------- -
V
Coding
Gain correspondence (COARSE)
ref
= 2.5 V.
= 32
N
for N
COARSE
1
COARSE
–
Rev. 03 — 21 July 2000
----------------- -
32 16
N
FINE
+
FINE
1
Triple high-speed Analog-to-Digital Converter 110 Msps
= 32).
= 0).
Clamp code
...
0
...
63.5
64
120
...
136
Gain
0.825
2.5
63.5
63
62.5
----- -
16
1
=
--------------------------------------------------
V
Table
ref
N
COARSE
512 N
6. The gain is linear with reference to the
–
+
FINE
1
1
2
LSB peak-to-peak
ADC output
underflow
0
...
63 or 64
64
120
136
V
1.212
0.4
32
i
to be full-scale (V)
© Philips Electronics N.V. 2000. All rights reserved.
TDA8752B
18 of 38
(5)