參數(shù)資料
型號(hào)： TDA8709AT-T
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO28
文件頁(yè)數(shù)： 28/28頁(yè)
文件大小： 126K
代理商： TDA8709AT-T
June 1994
9
Philips Semiconductors
Product specication
Video analog input interface
TDA8709A
Notes to the “Characteristics”
1. 0 dB is obtained at the AGC amplifier when applying Vi(p-p) = 1.33 V.
2. The output current at pin 19 should not exceed 1 mA. The load impedance RL should be referenced to VCCA and
defined as:
a) AC impedance
≥1k and the DC impedance >2.7 k.
b) The load impedance should be coupled directly to the output of the amplifier so that the DC voltage supplied by
the clamp is not disturbed.
3. Input signals with the same amplitude. Gain is adjusted to obtain ANOUT = 1.33 V (p-p).
4. Signal-to-noise ratio measured with 5 MHz bandwidth:
5. The voltage ratio is expressed as:
for VI = 1 V (p-p), gain at 100 kHz = 1 and 1 V supply variation.
6. It is recommended that the rise and fall times of the clock are
≥2 ns. In addition, a ‘good layout’ for the digital and
analog grounds is recommended.
7. These measurements are realized on analog signals after a digital-to-analog conversion (TDA8702 is used).
8. The supply voltage rejection is the relative variation of the analog signal (full-scale signal at input) for 1 V of supply
variation:
9. Full-scale sine wave (fi = 4.4 MHz; fclk = 27 MHz).
S
N
----
20 log
V
ANOUT p
p
–
()
V
ANOUT (RMS noise)
---------------------------------------------- at B = 5 MHz.
=
SVRR1
20 log
V
CCA
V
CCA
------------------
G
--------
×
=
SVRR2
V
I00
()
V
IFF
()
–
()
V
I00
()
V
IFF
()
–
()
+
V
CCA
-----------------------------------------------------------------------------------------------------
=
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