SA575D [NXP]
Low voltage compandor; 低压扩
| 型号： | SA575D |
| 厂家： | 
NXP |
| 描述： | Low voltage compandor |
| 文件： | 总14页 (文件大小：105K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RF COMMUNICATIONS PRODUCTS
SA575
Low voltage compandor
Product specification
Replaces data of 1997 June 28
1997 Nov 07
IC17
Philip s Se m ic ond uc tors
Philips Semiconductors
Product specification
Low voltage compandor
SA575
DESCRIPTION
PIN CONFIGURATION
The SA575 is a precision dual gain control circuit designed for low
voltage applications. The SA575’s channel 1 is an expandor, while
channel 2 can be configured either for expandor, compressor, or
automatic level controller (ALC) application.
1
D and DK Packages
1
2
3
4
5
6
7
8
+V
-V
V
20 V
IN1
IN1
CC
19 +V
18 -V
IN2
IN2
OUT
FEATURES
1
17 V
RECT. IN1
OUT2
• Operating voltage range from 3V to 7V
16 RECT.IN2
C
RECT1
• Reference voltage of 100mV
= 0dB
RMS
SUM OUT 1
COMP. IN1
15 C
RECT2
• One dedicated summing op amp per channel and two extra
14 SUM OUT2
uncommitted op amps
13 COMP.IN2
V
REF
• 600Ω drive capability
12 SUM NODE 2
9
GAIN CELL IN1
GND
• Single or split supply operation
• Wide input/output swing capability
• 3000V ESD protection
10
11 GAIN CELL IN2
NOTE:
1. Available in large SOL package only.
SR00703
Figure 1. Pin Configuration
APPLICATIONS
• Portable broadcast mixers
• Wireless microphones
• Modems
• Portable communications
• Cellular radio
• Cordless telephone
• Consumer audio
• Electric organs
• Hearing aids
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
DWG
20-Pin Plastic Small Outline Large
20-Pin Plastic Shrink Small Outline Package (SSOP)
SA575D
SOT163-1
SOT266-1
-40 to +85°C
SA575DK
ABSOLUTE MAXIMUM RATINGS
RATING
SA575
SYMBOL
PARAMETER
UNITS
V
Single supply voltage
–0.3 to 8
V
V
CC
V
Voltage applied to any other pin
Operating ambient temperature range
Storage temperature range
–0.3 to (V +0.3)
IN
CC
T
-40 to +85
-65 to +150
112
°C
A
T
STG
°C
θ
Thermal impedance
SOL
°C/W
°C/W
JA
SSOP
117
2
1997 Nov 07
853-1665 18666
Philips Semiconductors
Product specification
Low voltage compandor
SA575
BLOCK DIAGRAM and TEST CIRCUIT
0.1µF
V
+5V
CC
C15
GND
10µF
+
–
1
20
575
V
CC
V
IN
+
+
2
19
18
17
16
15
14
13
12
11
C14
R13
10k
OP AMP
V
REF
C3
V
3
4
–
OUT
+
10µF
OP AMP
3.8k
C11
+
5
4.7µF
+
3.8k
C
RECT
2.2µF
C10
C
RECT
Σ
+
6
V
OUT
+
2.2µF
GND
10µF
Σ
C6
7
10k
V
V
IN
+
10µF
R8
V
8
REF
REF
30k
10k
10k
+
R7
9
∆G
10µF
+
10k
30k
1µF
C8
∆G
10
GND
GND
GND
GND
SR00704
Figure 2. Block Diagram and Test Circuit
DC ELECTRICAL CHARACTERISTICS
Typical values are at T = 25°C. Minimum and Maximum values are for the full operating temperature range: -40 to +85°C for SA575, except
A
SSOP package is tested at +25°C only. V = 5V, unless otherwise stated. Both channels are tested in the Expandor mode (see Test Circuit)
CC
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
SA575
TYP
UNITS
MIN
MAX
For compandor, including summing amplifier
1
V
Supply voltage
Supply current
Reference voltage
3
3
5
7
V
CC
CC
I
No signal
4.2
2.5
5.5
2.6
mA
V
2
V
REF
V
CC
= 5V
2.4
10
R
Summing amp output load
Total harmonic distortion
Output voltage noise
Unity gain level
kΩ
%
L
THD
1kHz, 0dB BW = 3.5kHz
0.12
6
1.5
30
E
NO
BW = 20kHz, R = 0Ω
µV
dB
mV
mV
S
0dB
1kHz
-1.5
-150
-100
1.5
150
100
V
OS
Output voltage offset
Output DC shift
No signal
No signal to 0dB
Gain cell input = 0dB, 1kHz
Rectifier input = 6dB, 1kHz
-1.0
-1.0
1.0
1.0
dB
dB
Gain cell input = 0dB, 1kHz
Rectifier input = -30dB, 1kHz
Tracking error relative to 0dB
3
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
DC ELECTRICAL CHARACTERISTICS (cont.)
LIMITS
SA575
TYP
SYMBOL
PARAMETER
TEST CONDITIONS
UNITS
MAX
MIN
Crosstalk
For operational amplifier
Output swing
1kHz, 0dB, C
= 220µF
-80
-65
dB
REF
V
O
R = 10kΩ
L
V
-0.4
V
CC
V
Ω
CC
R
Output load
1kHz
600
L
CMR
Input common-mode range
Common-mode rejection ratio
Input bias current
Input offset voltage
Open-loop gain
0
V
V
CC
CMRR
60
-1
80
dB
µA
mV
dB
V/µs
MHz
µV
dB
I
B
V
IN
= 0.5V to 4.5V
1
V
OS
3
A
VOL
R = 10kΩ
L
80
1
SR
Slew rate
Unity gain
Unity gain
GBW
Bandwidth
3
E
NI
Input voltage noise
Power supply rejection ratio
BW = 20kHz
1kHz, 250mV
2.5
60
PSRR
NOTES:
1. Operation down to V = 2V is possible, but performance is reduced. See curves in Figure 7a and 7b.
CC
2. Reference voltage, V
, is typically at 1/2V
.
REF
CC
better filtered the power supply, the smaller this capacitor can be.
R12 provides DC reference voltage to the amplifier of channel B.
R6 and R7 provide a DC feedback path for the summing amp of
channel B, while C7 is a short-circuit to ground for signals. C14 and
C15 are for power supply decoupling. C14 can also be eliminated if
the power supply is well regulated with very low noise and ripple.
FUNCTIONAL DESCRIPTION
This section describes the basic subsystems and applications of the
SA575 Compandor. More theory of operation on compandors can
be found in AN174 and AN176. The typical applications of the
SA575 low voltage compandor in an Expandor (1:2), Compressor
(2:1) and Automatic Level Control (ALC) function are explained.
These three circuit configurations are shown in Figures 3, 4, 5
respectively.
DEMONSTRATED PERFORMANCE
The applications demo board was built and tested for a frequency
range of 20Hz to 20kHz with the component values as shown in
The SA575 has two channels for a complete companding system.
The left channel, A, can be configured as a 1:2 Expandor while the
right channel, B, can be configured as either a 2:1 Compressor, a
1:2 Expandor or an ALC. Each channel consists of the basic
companding building blocks of rectifier cell, variable gain cell,
Figure 6 and V = 5V. In the expandor mode, the typical input
CC
dynamic range was from -34dB to +12dB where 0dB is equal to
100mV
. The typical unity gain level measured at 0dB @ 1kHz
RMS
input was +0.5dB and the typical tracking error was +0.1dB for input
range of -30 to +10dB.
summing amplifier and V
cell. In addition, the SA575 has two
REF
additional high performance uncommitted op amps which can be
utilized for application such as filtering, pre-emphasis/de-emphasis
or buffering.
In the compressor mode, the typical input dynamic range was from
-42dB to +18dB with a tracking error +0.1dB and the typical unity
gain level was +0.5dB.
In the ALC mode, the typical input dynamic range was from -42dB to
+8dB with typical output deviation of +0.2dB about the nominal
output of 0dB. For input greater than +9dB in ALC configuration, the
summing amplifier sometimes exhibits high frequency oscillations.
There are several solutions to this problem. The first is to lower the
values of R6 and R7 to 20kΩ each. The second is to add a current
limiting resistor in series with C12 at Pin 13. The third is to add a
compensating capacitor of about 22 to 30pF between the input and
output of summing amplifier (Pins 12 and 14). With any one of the
above recommendations, the typical ALC mode input range
increased to +18dB yielding a dynamic range of over 60dB.
Figure 6 shows the complete schematic for the applications demo
board. Channel A is configured as an expandor while channel B is
configured so that it can be used either as a compressor or as an
ALC circuit. The switch, S1, toggles the circuit between compressor
and ALC mode. Jumpers J1 and J2 can be used to either include
the additional op amps for signal conditioning or exclude them from
the signal path. Bread boarding space is provided for R1, R2, C1,
C2, R10, R11, C10 and C11 so that the response can be tailored for
each individual need. The components as specified are suitable for
the complete audio spectrum from 20Hz to 20kHz.
The most common configuration is as a unity gain non-inverting
buffer where R1, C1, C2, R10, C10 and C11 are eliminated and R2
and R11 are shorted. Capacitors C3, C5, C8, and C12 are for DC
blocking. In systems where the inputs and outputs are AC coupled,
these capacitors and resistors can be eliminated. Capacitors C4
and C9 are for setting the attack and release time constant.
EXPANDOR
The typical expandor configuration is shown in Figure 3. The
variable gain cell and the rectifier cell are in the signal input path.
The V
is always 1/2 V to provide the maximum headroom
CC
REF
without clipping. The 0dB ref is 100mV
. The input is AC
RMS
coupled through C5, and the output is AC coupled through C3. If in
a system the inputs and outputs are AC coupled, then C3 and C5
can be eliminated, thus requiring only one external component, C4.
The variable gain cell and rectifier cell are DC coupled so any offset
C6 is for decoupling and stabilizing the voltage reference circuit.
The value of C6 should be such that it will offer a very low
impedance to the lowest frequencies of interest. Too small a
capacitor will allow supply ripple to modulate the audio path. The
4
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
voltage between Pins 4 and 9 will cause small offset error current in
the rectifier cell. This will affect the accuracy of the gain cell. This
can be improved by using an extra capacitor from the input to Pin 4
and eliminating the DC connection between Pins 4 and 9.
The expandor gain expression and the attack and release time
constant is given by Equation 1 and Equation 2, respectively.
Equation 3.
1/2
3.8k x 100µA
Compressor gain =
4V (avg)
IN
where V (avg) = 0.95V
IN
IN(RMS)
Equation 1.
Equation 4.
4V (avg)
IN
τ
= τ = 10k x C
= 10k x C4
R
A
RECT
Expandor gain =
3.8k x 100µA
AUTOMATIC LEVEL CONTROL
where V (avg) = 0.95V
IN
IN(RMS)
The typical Automatic Level Control circuit configuration is shown in
Figure 5. It can be seen that it is quite similar to the compressor
schematic except that the input to the rectifier cell is from the input
path and not from the feedback path. The input is AC coupled
through C12 and C13 and the output is AC coupled through C8.
Once again, as in the previous cases, if the system input and output
signals are already AC coupled, then C12, C13 and C8 could be
eliminated. Concerning the compressor, removing R6, R7 and C7
Equation 2.
τ
= τ = 10k x C
= 10k x C4
R
A
RECT
COMPRESSOR
The typical compressor configuration is shown in Figure 4. In this
mode, the rectifier cell and variable gain cell are in the feedback
path. R6 and R7 provide the DC feedback to the summing amplifier.
The input is AC coupled through C12 and output is AC coupled
through C8. In a system with inputs and outputs AC coupled, C8
and C12 could be eliminated and only R6, R7, C7, and C13 would
be required. If the external components R6, R7 and C7 are
eliminated, then the output of the summing amplifier will motor-boat
in absence of signals or at extremely low signals. This is because
there is no DC feedback path from the output to input. In the
presence of an AC signal this phenomenon is not observed and the
circuit will appear to function properly.
will cause motor-boating in absence of signals. C
is necessary
COMP
to stabilize the summing amplifier at higher input levels. This circuit
provides an input dynamic range greater than 60dB with the output
within +0.5dB typical. The necessary design expressions are given
by Equation 5 and Equation 6, respectively.
Equation 5.
3.8k x 100µA
ALC gain =
4V (avg)
IN
Equation 6.
The compressor gain expression and the attack and release time
constant is given by Equation 3 and Equation 4, respectively.
τ
= τ = 10k x C
= 10k x C9
R
A
RECT
7
6
10k
C5
9
EXP IN
C3
∆G
Σ
10µF
10k
EXP OUT
10µF
4
3.8k
5
8
2.2µF
C4
V
REF
SR00705
Figure 3. Typical Expandor Configuration
5
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
R6
R7
30k
30k
1µF
C7
V
REF
8
12
C8
Σ
14
11
C12
13
COMP OUT
10µF
COMP IN
10k
10µF
∆G
10k
C13
16
3.8k
4.7µF
15
2.2µF
C9
SR00706
Figure 4. Typical Compressor Configuration
R7
R6
30k
30k
1µF
C7
C COMP
V
22pF
REF
8
12
C8
Σ
14
C12
ALC OUT
13
10µF
ALC IN
10µF
10k
11
∆G
10k
C13
16
4.7µF
3.8k
16
2.2µF
C9
SR00707
Figure 5. Typical ALC Configuration
6
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
V
-5V
CC
C15
V
REF
0.1µF
C14
+
–
1
2
20
19
18
17
16
15
14
13
12
11
575
V
R12
47µF
CC
10k
C12
COMP/
R1
+
ALC
IN
OP AMP
10µF
C1
C2
R2
R10
3
–
C10
R11
OP AMP
C3
C11
J2
J1
EXP
OUT
4
10µF
3.8k
C13
ALC
5
S1
4.7µF
3.8k
COMP
C4
2.2µF
C9
Σ
6
2.2µF
Σ
C5
10µF
7
EXP
IN
10k
V
C8
COMP/
ALC
OUT
8
REF
R7
30k
10µF
10k
10k
V
REF
R6
C6
10µF
9
∆G
C7
1µF
30k
10k
∆G
10
GND
SR00708
Figure 6. SA575 Low Voltage Expandor/Compressor/ALC Demo Board
7
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
V
V
7V
5V
CC
CC
0.2
0.1
0.0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
–0.8
–0.9
–1.0
V
V
3V
2V
CC
CC
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
a. Unity Gain Error vs Temperature and V
CC
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
V
V
7V
CC
5V
CC
V
V
3V
2V
CC
CC
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
b. I vs Temperature and V
CC
CC
SR00709
Figure 7. Temperature and V Curves
CC
8
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
TYPICAL PERFORMANCE CHARACTERISTICS
GENERAL DIAGRAM
4.7µF
8
10µF
6
4
2
0
10dB IN
REC
SUM
∆G
INPUT
(20–20kHz)
OUTPUT
V
= 5V
0dB IN
CC
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
-40dB IN
–22
10
100
1000
10000
30000
FREQUENCY (Hz)
SR00710
Figure 8. Compressor Output Frequency Response
9
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
8
INPUT
(20–20kHz)
GENERAL DIAGRAM
6
4
2
0
2.5dB IN
4.7µF
REC
OUTPUT
SUM
∆G
0dB IN
10µF
V
= 5V
CC
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
-10dB IN
–22
10
100
1000
10000
30000
FREQUENCY (Hz)
SR00711
Figure 9. Expandor Output Frequency Response
10
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
COMPRESSOR IN
+10dB
EXPANDOR OUT
+10dB
+5dB
0dB
100mV
0dB
100mV
0dB
–5dB
–10dB
–10dB
–20dB
–10dB
–20dB
–15dB
–20dB
–25dB
–30dB
–40dB
–50dB
–30dB
–40dB
–50dB
COMPRESSION
EXPANSION
SR00712
Figure 10. The Companding Function
11
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
SO20: plastic small outline package; 20 leads; body width 7.5 mm
SOT163-1
12
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
13
1997 Nov 07
Philips Semiconductors
Product specification
Low voltage compandor
SA575
DEFINITIONS
Data Sheet Identification
Product Status
Definition
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
Objective Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Preliminary Specification
Product Specification
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
orsystemswheremalfunctionofaPhilipsSemiconductorsandPhilipsElectronicsNorthAmericaCorporationProductcanreasonablybeexpected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Philips
Semiconductors
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