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參數(shù)資料
| 型號： | 935068830112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO32 |
| 封裝： | 7.50 MM, PLASTIC, SOP-32 |
| 文件頁數(shù)： | 27/30頁 |
| 文件大小： | 555K |
| 代理商： | 935068830112 |
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September 1994
6
Philips Semiconductors
Product specication
AM/FM stereo radio circuit
TEA5711; TEA5711T
FUNCTIONAL DESCRIPTION
The AM circuit incorporates a double balanced mixer, a
one pin low-voltage oscillator (up to 30 MHz) a
field-strength indicator output and is designed for
distributed selectivity.
The AM input is designed to be connected to the top of a
tuned circuit. AGC controls the IF amplification and for
large signals it lowers the input impedance.
The first AM selectivity can be an IFT as well as an IFT
combined with a ceramic filter; the second one is an IFT.
The FM circuit incorporates a tuned RF stage, a double
balanced mixer, a one-pin oscillator, a field-strength
indicator output and is designed for distributed IF ceramic
filters. The FM quadrature detector uses a ceramic
resonator.
The PLL stereo decoder incorporates a signal dependent
stereo circuit, a soft-mute circuit and a stereo indicator
LED driver.
Supply voltage behaviour
The TEA5711 incorporates internal stabilized power
supplies. The maximum supply voltage is 12 V, the
minimum voltage can go down temporarily to 1.8 V without
any loss in performance.
Due to the capacitor at pin 19 (RIPPLE) the IC gives
excellent performance, even when the actual supply
voltage at pin 25 (VP) drops below the voltage at pin 19
(RIPPLE).
Figures 4, 5 and 6 show that Vstab, which is dominant for
the overall IC performance, remains unaffected, even if VP
drops down to 1.8 V or less. In this typical example the
static or average VP is equal to 2.5 V. Dips in Vstab appear
only when the peak-to-peak value of the AC-component of
VP > 2 V, i.e. when the dynamic value of VP drops down to
1.5 V for a short moment.
Fig.4
Supply voltage behaviour; VP as a
function of time.
Fig.5
Supply voltage behaviour; Vripple as a
function of time.
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Fig.6
Supply voltage behaviour; Vstab as a
function of time.
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