MT8971B/72B
22
21
20
19
18
17
16
15
14
13
12
1
2
3
4
5
6
7
8
LOUT
VBias
VRef
MS2
MS1
MS0
VDD
LIN
•
TEST
LOUT DIS
Precan
OSC1
OSC2
C4/TCK
F0o/RCK
DSTi/Di
NC
5
25
24
23
22
21
20
19
MS2
NC
MS1
MS0
RegC
6
LOUT DIS
Precan
OSC1
OSC2
NC
7
8
9
RegC
10
11
F0/CLD
NC
F0/CLD
CDSTi/CDi
CDSTo/CDo
VSS
C4/TCK
9
10
11
DSTo/Do
22 PIN PDIP/CERDIP
28 PIN PLCC
Figure 2 - Pin Connections
Description
Pin Description
Pin #
Name
DIP PLCC
1
2
3
2
3
4
LOUT
VBias
VRef
Line Out. Transmit Signal output (Analog). Referenced to VBias
Internal Bias Voltage output. Connect via 0.33 µF decoupling capacitor to VDD
Internal Reference Voltage output. Connect via 0.33 µF decoupling capacitor to VDD
.
.
.
4,5, 5,7, MS2-MS0 Mode Select inputs (Digital). The logic levels present on these pins select the various
6
8
operating modes for a particular application. See Table 1 for the operating modes.
7
9
RegC
Regulator Control output (Digital). A 512 kHz clock used for switch mode power
supplies. Unused in MAS/MOD mode and should be left open circuit.
8
10
F0/CLD Frame Pulse/C-Channel Load (Digital). In DN mode a 244 ns wide negative pulse input
for the MASTER indicating the start of the active channel times of the device. Output for
the SLAVE indicating the start of the active channel times of the device. Output in MOD
mode providing a pulse indicating the start of the C-channel.
9
12
13
CDSTi/ Control/Data ST-BUS In/Control/Data In (Digital). A 2.048 Mbit/s serial control &
CDi
signalling input in DN mode. In MOD mode this is a continuous bit stream at the bit rate
selected.
10
CDSTo/ Control/Data ST-BUS Out/Control/Data Out (Digital). A 2.048 Mbit/s serial control &
CDo
signalling output in DN mode. In MOD mode this is a continuous bit stream at the bit rate
selected.
11
12
14
15
VSS
Negative Power Supply (0V).
DSTo/Do Data ST-BUS Out/Data Out (Digital). A 2.048 Mbit/s serial PCM/data output in DN mode.
In MOD mode this is a continuous bit stream at the bit rate selected.
13
14
16
17
DSTi/Di Data ST-BUS In/Data In (Digital). A 2.048 Mbit/s serial PCM/data input in DN mode. In
MOD mode this is a continuous bit stream at the bit rate selected.
F0o/RCK Frame Pulse Out/Receive Bit Rate Clock output (Digital). In DN mode a 244 ns wide
negative pulse indicating the end of the active channel times of the device to allow daisy
chaining. In MOD mode provides the receive bit rate clock to the system.
15
16
19
21
C4/TCK Data Clock/Transmit Baud Rate Clock (Digital). A 4.096 MHz TTL compatible clock
input for the MASTER and output for the SLAVE in DN mode. For MOD mode this pin
provides the transmit bit rate clock to the system.
OSC2
Oscillator Output. CMOS Output.
9-108