參數(shù)資料
型號: TDA938X
廠商: NXP Semiconductors N.V.
英文描述: TV signal processor-Teletext decoder with embedded m-Controller
中文描述: 電視信號處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù): 38/140頁
文件大?。?/td> 570K
代理商: TDA938X
Philips Semiconductors
Preliminary specification
1999 Sep 28
38
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA 935X/6X/8X series
.
Figure 14 SAD Block Diagram
SAD Input Voltage
The external analogue voltage that is used for comparison with the internally generated DAC voltage do not
have the same voltage range. The DAC has a lower reference level of V
SSA
and an upper reference level of
V
SSA
.The resolution of the DAC voltage with a nominal values is 3.3/256 ~ 13mv. The external analogue voltage
has a lower value equivalent to V
SSA
and an upper value equivalent to V
DDP
- V
tn
, were V
tn
is the threshold
voltage for an NMOS transistor. The reason for this is that the input pins for the analogue signals (P3.0 to P3.3)
are 5V tolerant for normal port operations, i.e. when not used as analogue input. To protect the analogue
multiplexer and comparator circuitry from the 5V, a series transistor is used to limit the voltage. This limiting
introduces a voltage drop equivalent to V
tn
(~0.6V) on the input voltage. Therefore for an input voltage in the
range V
DDP
to V
DDp
-V
tn
the SAD returns the same comparison value.
When utilising Port 3.0 to Port 3.3 for SAD operation, the associated PWM outputs must be disabled.
+
-
VHI
MUX
4-1
8bit
DAC
SAD<7:0>
ADC0
ADC1
ADC2
ADC3
CH<1:0>
V
DDP
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