MSP 34x7G
PRELIMINARY DATA SHEET
4.3. Pin Descriptions
CAPLM – Volume Capacitor Loudspeakers (Fig. 4–18)
A 10µF capacitor to AHVSUP must be connected to
this pin. It serves as smoothing filter for volume
changes in order to suppress audible plops. The value
of the capacitor can be lowered to 1µF if faster
response is required. The area encircled by the trace
lines should be minimized, keep traces as short as
possible. This input is sensitive for magnetic induction.
NC – Pin not connected
I2C_CL – I2C Clock Input/Output (Fig. 4–12)
Via this pin the I2C bus clock signal has to be supplied.
The signal can be pulled down by the MSP in case of
wait conditions.
I2C_DA – I2C Data Input/Output (Fig. 4–12)
Via this pin the I2C bus data is written to or read from
the MSP.
AHVSS* – Ground for Analog Power Supply High Volt-
age
Ground connection for the analog circuitry of the MSP
(except IF input).
TP_CO – Clock Output
Output of clock signal used in order to define capaci-
tors at the crystal oscillator (see Section 4.6.2.4. on
page 44).
AGNDC – Internal Analog Reference Voltage
This pin serves as the internal ground connection for
the analog circuitry (except IF input). It must be con-
nected to the VREF pins with a 3.3 µF and a 100 nF
capacitor in parallel. This pins shows a DC level of typ-
ically 3.73 V.
DVSUP* – Digital Supply Voltage
Power supply for the digital circuitry of the MSP. Must
be connected to a power supply.
SC1_IN_L/R – SCART1 Inputs (Fig. 4–8)
DVSS* – Digital Ground
Ground connection for the digital circuitry of the MSP
The analog input signal for SCART1 is fed to this pin.
Analog input connection must be AC coupled.
RESETQ – Reset Input (Fig. 4–5)
In the steady state, high level is required. A low level
resets the MSP 34x7G.
VREFTOP – Reference Voltage IF AD Converter
(Fig. 4–10)
Via this pin, the reference voltage for the IF AD con-
verter is decoupled. It must be connected to AVSS
pins with a 10µF and a 100nF capacitor in parallel.
Traces must be kept short.
VREF2 – Reference Ground 2
Reference analog ground. This pin must be connected
separately to ground (AHVSS). VREF2 serves as a
clean ground and should be used as the reference for
analog connections to the loudspeaker outputs.
MONO_IN – Mono Input (Fig. 4–8)
The analog mono input signal is fed to this pin. Analog
input connection must be AC coupled.
DACM_R/L – Loudspeaker Outputs (Fig. 4–15)
Output of the loudspeaker signal. A 1nF capacitor to
AHVSS must be connected to these pins. The DC off-
set on these pins depends on the selected volume.
AVSS* – Ground for Analog Power Supply Voltage
Ground connection for the analog IF input circuitry of
the MSP.
VREF1 – Reference Ground 1
AVSUP* – Analog Power Supply Voltage
Power is supplied via this pin for the analog IF input cir-
cuitry of the MSP. This pin must be connected to the
+5 V supply.
Reference analog ground. This pin must be connected
separately to ground (AHVSS). VREF1 serves as a
clean ground and should be used as the reference for
analog connections to the SCART output.
ANA_IN1+ – IF Input 1 (Fig. 4–10)
SC1_OUT_R/L – SCART1 Outputs (Fig. 4–16)
Output of the SCART1 signal. Connections to these
pins must use a 100 ohm series resistor and are
intended to be AC coupled.
The analog sound if signal is supplied to this pin.
Inputs must be AC coupled. This pin is designed as
symmetrical input: ANA_IN1+ is internally connected
to one input of a symmetrical op amp, ANA_IN− to the
other.
AHVSUP* – Analog Power Supply High Voltage
Power is supplied via this pin for the analog circuitry of
the MSP (except IF input). This pin must be connected
to the +8 V supply.
ANA_IN− – IF Common (Fig. 4–10)
This pin serves as a common reference for ANA_IN1+
input.
TESTEN – Test Enable Pin (Fig. 4–6)
This pin enables factory test modes. For normal opera-
tion it must be connected to ground.
36
Micronas
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