Philips TDA9964 - Manual (Page 12)

Philips Semiconductors
TDA9964
12-bit, 3.0 V, 30 Msps analog-to-digital interface for CCD cameras
Objective specification Rev. 03 — 16 January 2001 12 of 23
9397 750 07918 © Philips Electronics N.V. 2001. All rights reserved.
Fig 7. Total gain from CDS input to ADC input as a function of PGA input code.
0 64 128 255
30
0
1.9
25.9
24
192
PGA input code
TOTAL
gain
(dB)
18
12
6
FCE521
Noise measurement at ADC outputs: Coupling capacitor at input is grounded, so only noise contribution of the front-end is
evaluated. Front-end works at 30 Mpixels with line of 1024 pixels of which the first 40 lines are used to run CLPOB and the
last 40 lines for CLPDM. Data at the ADC outputs is measured during the other pixels. As a result, the standard deviation of the
codes statistic is computed, resulting in the noise. No quantization noise is taken into account as there is no input.
Fig 8. Typical total noise performance as a function of PGA gain.
handbook, halfpage
0 64 128 255
6
0
4
5
192
PGA code
Ntot(rms)
(LSB)
3
2
1
FCE522