Rainbow Electronics DS2130Q - Manual (Page 17)

DS2130Q
041295 17/22
DTMF RECEIVER/GENERATOR TEST CIRCUIT Figure 12
+5V
–5V
+5V
MCLK
SDI
SCLK
DT.0–DT.3
DS2130
PCMCLK
CPXCLK
CPXFS
PCMFS
CPXIN
PCMOUT
PCMIN
CPXOUT
Host
uProcessor
CS
SPS
V CC
GND
TM0
TM1
RST Power-on
Reset
500
4
Detect
Monitor
0 dBm0 = 1.231 Vrms
CLK1
CLK2
CLK3
TXCLK
RXCLK
TXSYNC
RXSYNC
GA2
GA1
VREF
AOUT
PD
VDD
VSS
DGND
AGND
AIN
PCMOUT
PCMIN
NC
CODEC/FILTER
DTMF
INPUT
DTMF
OUTPUT
+5V
NC
CLK1 = 11-13 MHz square wave
CLK2 = 2.048 MHz + 0.1%
CLK3 = 8 KHz (must be derived from 2.048 source)
10K
0.1 uF
DTMF RECEIVER TIMING Figure 13
ЙЙЙЙ
ЙЙЙЙ
ЙЙЙЙ
ЙЙЙЙ
ЙЙЙ
ЙЙЙ
DTMF
DIGIT 1
DTMF
DIGIT 5
DTMF
DIGIT 9
DTMF
DIGIT 9 DTMF
INPUT
DT0-3
t TAC t PAC t TRJ t PRJ
t
DTD
Energy reporting DTMF reporting
0001 1001