ST75951 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST75951' PDF : 21 Pages View PDF
ST75951
BLOCK DIAGRAM
VCMS VCMP
DVDD DGND
AUXIN 41
D3 31
D4 30
32 29
5
6
HIGH
PASS
FILTER
F0
LOW
PASS
FILTER
Bit DR DETECTOR
RING 15
D1 35
D2 34
MUX
F0
GAIN
2dB
GAIN
0dB
ATTE
6dB
ATTE INFINITE
AVDD AGND1 AGND2
VCM VREFN VREFP
40 23
38
39 22 21
REFERENCE
VOLTAGE
RESET PWRDWN
43
11
HC0 HC1
10 9
GAIN
MUX
ANALOG
MODULATOR
LOW-PASS
(0.425 x Sampling
Frequency)
DAC 1 BIT
First Order
Differential
Switched
Capacitor
Filter
2nd ORDER
MODULATOR
LOW-PASS
(0.425 x Sampling
Frequency)
45 TSTD1
3
FS
2
SCLK
47
DOUT
46
DIN
44
TS
STLC75951
28 33
TSTA1 TSTA2
CLOCK GENERATOR
27 26 14 4
8
7
D5 D6
M/S MCM XTALIN XTALOUT
(MCLK)
DAA CONTROL + GPIO
16
GPI
42 20 19 18 17
HM
GPIO0 GPIO1 GPIO2 GPIO3
FUNCTIONAL DESCRIPTION
ST75951 is a modem AFE front-end integrating the
modem side of Krypton K951 and fully compatible
to work with ST952.
1 - Transmit Section
The functions included in the transmit section are :
- D/A converter,
- F0 modulator,
- Programmable stage +2dB gain, 0dB gain, 6dB
attenuation or infinite attenuation,
- Transmit Filter including noise shaper and Sinx/x
correction.
The digital base Band data (DIN) are converted and
modulated at F0 and send differentially (D1, D2) to
ST952 through capacitive connection.
2 - Receive Section
The functions included in the receive section are :
- Main and Aux inputs,
- Programmable gain 0/6dB,
- A/D converter,
- F0 demodulator,
- Receive filter.
The analog differential Main input signal (D3, D4)
coming from ST952 is demodulated at F0, goes to
the multiplexer and gain receive block then is digi-
tally converted and output on DOUT which is the
base band data.
Thanks to the multiplexer, we can also process
base band analog signal on AUXIN.
3 - Clock Generator
ST75951 generates all clocks from either a Master
clock input on XTALIN (MCLK) or a crystal oscillator
connected between XTALIN and XTALOUT.
The bypass of the divider M and Q is selected by
setting the MCM input pin to ’0’.
To be able to provide externally the sampling fre-
quency (Slave mode), M/S input pin must be set
to ’0’ (see Figure 2).
6/21
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