TEA5767HL NXP Semiconductors, TEA5767HL Datasheet - Page 9

• Manufacturer Part Number: TEA5767HL
• Manufacturer: NXP Semiconductors

Specifications of TEA5767HL

• Operating Temperature Classification: Commercial
• Package Type: LQFP
• Product Depth (mm): 7mm
• Product Length (mm): 7mm
• Operating Supply Voltage (typ): 3V
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
7.7
Fully integrated IF filter.
7.8
The FM quadrature demodulator has an integrated
resonator to perform the phase shift of the IF signal.
7.9
The FM IF analog level voltage is converted to 4 bits digital
data and output via the 3-wire bus.
7.10
The IF counter outputs a 7-bit count result via the 3-wire
bus.
7.11
The low-pass filtered level voltage drives the soft mute
attenuator at low RF input levels. The soft mute function
can be switched off via the 3-wire bus.
7.12
The PLL stereo decoder is adjustment-free. The stereo
decoder can be switched to mono via the 3-wire bus.
7.13
With a decreasing RF input level the MPX decoder blends
from stereo to mono to limit the output noise. The
continuous mono to stereo blend can also be programmed
via the 3-wire bus to an RF level depending switched mono
to stereo transition. Stereo Noise Cancelling (SNC) can be
switched off via the 3-wire bus.
7.14
The audio bandwidth will be reduced with a decreasing RF
input level. This function can be switched off via the 3-wire
bus.
7.15
Two software programmable ports (open-collector) can be
addressed via the 3-wire bus.
The port 1 (pin SWPORT1) function can be changed with
write data byte 4 bit 0 (see Table 10). Pin SWPORT1 is
then output for the ready flag of read byte 1.
2004 Sep 13
Low-power FM stereo radio for
handheld applications
IF filter
FM demodulator
Level voltage generator and analog-to-digital
converter
IF counter
Soft mute
MPX decoder
Signal dependent mono to stereo blend
Signal dependent AF response
Software programmable ports
8
8
8.1
The 3-wire bus controls the write/read, clock and data lines
and operates at a maximum clock frequency of 400 kHz.
Before any READ or WRITE operation the pin
BUSENABLE has to be HIGH for at least 10 s.
Hint: By using the standby bit the IC can be switched into
a low current standby mode. In standby mode the IC must
be in the WRITE mode. When the IC is switched to READ
mode, during standby, the IC will hold the data line down.
The standby current can be reduced by deactivating the
bus interface (pin BUSENABLE LOW). If the bus interface
is deactivated (pin BUSENABLE LOW) without the
standby mode being programmed, the IC maintains
normal operation, but is isolated from the clock and data
line.
8.1.1
Data sequence: byte 1, byte 2, byte 3, byte 4 and byte 5
(the data transfer has to be in this order).
A positive edge at pin WRITE/READ enables the data
transfer into the IC. The data has to be stable at the
positive edge of the clock. Data may change while the
clock is LOW and is written into the IC on the positive edge
of the clock. Data transfer can be stopped after the
transmission of new tuning information with the first two
bytes or after each following byte.
A negative edge at pin WRITE/READ enables the data
transfer from the IC. The WRITE/READ pin changes while
the clock is LOW. With the negative edge at
pin WRITE/READ the MSB of the first byte occurs at
pin DATA.
The bits are shifted on the negative clock edge to pin
DATA and can be read on the positive edge.
To do two consecutive read or write actions,
pin WRITE/READ has to be toggled for at least one clock
period. When a search tuning request is sent, the IC
autonomously starts searching the FM band; the search
direction and search stop level can be selected. When a
station with a field-strength equal to or greater than the
stop level is found, the tuning system stops and the ready
flag bit is set to HIGH. When, during search, a band limit is
reached, the tuning system stops at the band limit and the
band limit flag bit is set to HIGH. The ready flag is also set
to HIGH in this case.
3-WIRE BUS AND BUS-CONTROLLED
FUNCTIONS
3-wire bus specification
D
ATA TRANSFER
TEA5767HL
Product specification