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PDF TP3040AV Data sheet ( Hoja de datos )
| Número de pieza | TP3040AV | |
| Descripción | TP3040/ TP3040A PCM Monolithic Filter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 1994
TP3040 TP3040A PCM Monolithic Filter
General Description
The TP3040 TP3040A filter is a monolithic circuit contain-
ing both transmit and receive filters specifically designed for
PCM CODEC filtering applications in 8 kHz sampled sys-
tems
The filter is manufactured using microCMOS technology
and switched capacitor integrators are used to simulate
classical LC ladder filters which exhibit low component sen-
sitivity
TRANSMIT FILTER STAGE
The transmit filter is a fifth order elliptic low pass filter in
series with a fourth order Chebyshev high pass filter It pro-
vides a flat response in the passband and rejection of sig-
nals below 200 Hz and above 3 4 kHz
RECEIVE FILTER STAGE
The receive filter is a fifth order elliptic low pass filter de-
signed to reconstruct the voice signal from the decoded de-
multiplexed signal which as a result of the sampling pro-
cess is a stair-step signal having the inherent sin x x fre-
quency response The receive filter approximates the func-
tion required to compensate for the degraded frequency re-
sponse and restore the flat passband response
Features
Y Designed for D3 D4 and CCITT applications
Y a5V b5V power supplies
Y Low power consumption
45 mW (0 dBm0 into 600X)
30 mW (power amps disabled)
Y Power down mode 0 5 mW
Y 20 dB gain adjust range
Y No external anti-aliasing components
Y Sin x x correction in receive filter
Y 50 60 Hz rejection in transmit filter
Y TTL and CMOS compatible logic
Y All inputs protected against static discharge due to
handling
Block Diagram
FIGURE 1
C1995 National Semiconductor Corporation TL H 6660
TL H 6660 – 1
RRD-B30M115 Printed in U S A
1 page  
AC Electrical Characteristics (Continued)
Unless otherwise specified TA e 25 C All parameters are specified for a signal level of 0 dBm0 at 1 kHz The 0 dBm0 level is
assumed to be 1 54 Vrms measured at the output of the transmit or receive filter Limits printed in BOLD characters are
guaranteed for VCC e a5 0V g5% VBB e b5 0V g5% TA e 0 C to 70 C by correlation with 100% electrical testing at TA e
25 C All other limits are assured by correlation with other production tests and or product design and characterization Typicals
specified at VCC e a5 0V VBB e b5 0V TA e 25 C
Symbol
Parameter
Conditions
Min Typ Max Units
RECEIVE OUTPUT POWER AMPLIFIER
IBP Input Leakage Current PWRI
RIP Input Resistance PWRI
b3 2V s VIN s 3 2V
0 1 3 mA
10 MX
ROP1
Output Resistance PWROa PWROb Amplifiers Active
1X
CLP Load Capacitance PWROa PWROb
500 pF
GApa
GApb
Gain PWRI to PWROa
Gain PWRI to PWROb
RLe600X Connected Between
PWROa and PWROb Input
Levele0 dBm0 (Note 4)
1 VV
b1 V V
GRpL
S Dp
VOSP
Gaintracking Relative to 0 dBm0
Output Level Including Receive Filter
Signal Distortion
Output DC Offset PWROa PWROb
Ve2 05 Vrms RLe600X(Notes 4 5)
Ve1 75 Vrms RLe300X
Ve2 05 Vrms RLe600X(Notes 4 5)
Ve1 75 Vrms RLe300X
PWRI Connected to GNDA
b0 1
b0 1
b50
01
01
b45
b45
50
dB
dB
dB
dB
mV
PSRR5 Power Supply Rejection of VCC or VBB PWRI Connected to GNDA
45
dB
Note 1 Maximum power consumption will depend on the load impedance connected to the power amplifier This specification listed assumes 0 dBm is delivered to
600X connected from PWROa to PWROb
Note 2 Voltage input to receive filter at 0V VFRO connected to PWRI 600X from PWROa to PWROb Output measured from PWROa to PWROb
Note 3 The 0 dBm0 level for the filter is assumed to be 1 54 Vrms measured at the output of the XMT or RCV filter
Note 4 The 0 dBm0 level for the power amplifiers is load dependent For RLe600X to GNDA the 0 dBm0 level is 1 43 Vrms measured at the amplifier output For
RLe300X the 0 dBm0 level is 1 22 Vrms
Note 5 VFRO connected to PWRI input signal applied to VFRI
Note 6 Previous revisions of the datasheet did not clearly indicate this specification requires power amps in powerdown (PWRI e b5 25V)
Typical Application
TL H 6660 – 2
R1 aR2
Note 1 Transmit voltage gain e
R2
c 02 (The filter itself introduces a 3 dB gain) (R1 aR2 t10k)
R4
Note 2 Receive gain e
R3 aR4
(R3 aR4t10k)
Note In the configuration shown the receive filter power amplifiers will drive a 600X T to R termination to a maximum signal level of 8 5 dBm An alternative
arrangement using a transformer winding ratio equivalent to 1 414 1 and 300X resistor RS will provide a maximum signal level of 10 1 dBm across a 600X
termination impedance
FIGURE 2
5
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