TDA8709A Datasheet, PDF (9/28 Pages) NXP Semiconductors – Video analog input interface

Philips Semiconductors
Video analog input interface
Product specification
TDA8709A
Notes to the “Characteristics”
1. 0 dB is obtained at the AGC amplifier when applying V_i(p-p) = 1.33 V.
2. The output current at pin 19 should not exceed 1 mA. The load impedance R_L should be referenced to V_CCA and
defined as:
a) AC impedance ≥1 kΩ and the DC impedance >2.7 kΩ.
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:
N-S-- ^{= 20 log} V-----_A^V---_N^--A-_O^--N--_U^--O-_T^---U-₍^-_R^-T---_M^{-(--pS----–-}_n^--po---_i^)-_s^--_e^--₎ ^{at B = 5 MHz.}
5. The voltage ratio is expressed as:
SVRR1 = 20 log^∆---V--V--_C--^C-_C---^C-_A--^A- × _∆---G--G--- for V_I = 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:
SVRR2 = -^∆-----⁽--V----^I---⁽--⁰--⁰---⁾----^–----V-----^I--⁽--^F---^F_∆---⁾-V-⁾----_C-⁺--_C----⁽_A--V-----^I--⁽--⁰---⁰--⁾----^–-----V----^I--⁽--^F---^F---⁾---⁾-
9. Full-scale sine wave (f_i = 4.4 MHz; f_clk = 27 MHz).
June 1994
9