參數(shù)資料
型號(hào): 935269580557
廠商: NXP SEMICONDUCTORS
元件分類(lèi): 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: PLASTIC, HTQFP-100
文件頁(yè)數(shù): 76/84頁(yè)
文件大?。?/td> 1054K
代理商: 935269580557
Koninklijke Philips Electronics N.V. Copyright 2001. All rights reserved.
9397 750 08865
78 of 84
Rev. 02 — 8 October 2001
Product data
PNX8510/11
Philips Semiconductors
Analog Companion Chip
Figure 27 provides an example for calculating the RSet for the video DACs from given output
voltage and termination.
Figure 27: Video Channel DAC Programming
IOUT
VBG
RS
-------------
è
16.4
100
-----------
×
1
100
M
+
100
---------------------
è
+
×
M
100
----------
28
N
+
23
16
×
-------------------
×
D
×
=
ì í
I1 = LSB current
IOUT = I1 x D
10-bit current DAC with programmable output level adjustments of fine and coarse
M = +/-7
4-bit
fine
adjust
6ICOMP1
N = 0..31
5-bit
coarse
adjust
D = 0..1023
10-bit
digital
inputs
pcomp
COMP
DAC 10
IOUT
IDUMP
separate output level coarse adjust for each DAC
IRef
RL = RO/2
RO = 2x75 Ohm
VSSA
RDUMP = 0.1 or 2 ohm
VSSA
RSet
VSSA
central fine adjust for both DACs
VBG = 1.22V
RSetnom = 1 kOhm for RL = 37.5 Ohm (double termination)
RSetmax = 2 kOhm for RL = 75 Ohm
ICOMPn = reference currents for up to 6 DACs
IOUT + IDUMP = 1023I1 = constant
IDUMP = (1023 - D) I1
VDUMP = IOUT x RL
VOUT = IOUT x RL
VOUTmin = 15.57 mA x 37.5 Ohm = 0.584 V (full-scale, fine adjust = 0%)
VOUTmax = 32.80 mA x 37.5 Ohm = 1230 V (full-scale, fine adjust = 0%)
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