TEA6845H Просмотр технического описания (PDF) - NXP Semiconductors.
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TEA6845H Datasheet PDF : 49 Pages
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Philips Semiconductors
New In Car Entertainment (NICE) car radio
Product specification
TEA6845H
7.3.5 AM NOISE DETECTOR AND BLANKER
The detection point for the AM noise blanker is the output
stage of AM mixer 1, while blanking is realized at the
output of the mixer 2.
Trigger sensitivity can be modified by changing the resistor
value at pin AMNBHOLD.
7.3.6 FM AND AM LEVEL DETECTOR
FM and AM level detectors provide the temperature
compensated output voltage. The starting points and
slopes of the level detector outputs are programmable via
the I2C-bus.
7.4 Test mode
The test mode of the IC is activated by:
• Sending the test byte (byte 5) to the IC
• Connecting pin FREF through a 100 kΩ resistor to
VDDA1
• Applying 50 µA to pin FREF.
If the test mode is enabled by pin FREF:
• The settling time of the AM IF2 AGC is reduced to less
than 100 ms in the nominal application
• The digital-to-analog converters for the antenna DAA
and the level DAA can be clocked directly by the SCL
line of the I2C-bus
• The output at pin FREF can be selected by the I2C-bus:
TEA6880H or TEF6890H reference frequency, PLL
reference frequency or PLL programmable divider
output frequency
• The RDS update control circuit can be clocked directly
via pin DAATD
• Pin T1AMAGC can be used to enable the load PLL
circuit of the RDS update control circuit
• Charge pumps can be set into 3-state mode.
8 LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 60134).
SYMBOL
PARAMETER
CONDITIONS MIN.
VDDA1
VDDA2
VDDA3
VDDA4
VDDA5
VDDA6
VDDD
∆VDD8.5-DD5
analog supply voltage 1 for on-chip power supply
analog supply voltage 2 for on-chip power supply
analog supply voltage 3 for VCO
analog supply voltage 4 for tuning PLL
analog supply voltage 5 for FM and AM RF
analog supply voltage 6 for IF amplifier 1 and 2
digital supply voltage
difference between any 8.5 V supply voltage and any
5 V supply voltage
note 1
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
−0.3
Tstg
Tamb
Ves
storage temperature
ambient temperature
electrostatic handling voltage
note 2
note 3
−55
−40
−200
−2 000
MAX.
+10
+6.5
+10
+10
+10
+10
+6.5
−
UNIT
V
V
V
V
V
V
V
V
+150
°C
+85
°C
+200
V
+2000 V
Notes
1. To avoid damage and wrong operation it is necessary to keep all 8.5 V supply voltages at a higher level than any 5 V
supply voltage. This is also necessary during power-on and power-down sequences. Precautions have to be
provided in such a way that interference cannot pull the 8.5 V supply down below the 5 V supply.
2. Machine model (R = 0 Ω, C = 200 pF).
3. Human body model (R = 1.5 kΩ, C = 100 pF).
2003 Feb 04
10
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