DS1666 [DALLAS]
Audio Digital Resistor; 音频数字电阻
| 型号： | DS1666 |
| 厂家： | 
DALLAS SEMICONDUCTOR |
| 描述： | Audio Digital Resistor |
| 文件： | 总7页 (文件大小：54K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1666, DS1666S
DS1666, DS1666S
Audio Digital Resistor
FEATURES
PIN ASSIGNMENT
• 128 position, digitally controlled potentiometer
NC
U/D
INC
CS
1
2
3
4
5
6
7
14
13
12
11
10
9
NC
• Operates from a +5 volts power supply with TTL sig-
V
V
V
V
V
CC
B
nal inputs
• Wide analog voltage range of ±5 volts
W
H
GND
NC
• Resistive elements are temperature compensated to
±20 percent end to end
L
NC
8
NC
• Low–power CMOS
14–PIN DIP (300 MIL)
See Mech. Drawings Section
• 14–pinDIPor16–pinSOICforsurfacemountapplica-
U/D
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
tions
NC
NC
V
B
• Default position on power up sets wiper position at
10%
INC
NC
V
V
W
H
CS
NC
NC
• Operating temperature range
NC
–
–40°C to +85°C; industrial
GND
V
L
16–PIN SOIC (300 MIL)
See Mech. Drawings Section
Resolution/Step
Resistance values Low End High End –3dB Point
DS1666–10 10KΩ
DS1666–50 50KΩ
DS1666–100100KΩ 243Ω
24Ω
122Ω
152Ω
759Ω
1.519KΩ 100 KHz
1.1 MHz
200 KHz
PIN DESCRIPTION
V
V
V
–
–
–
–
–
–
–
–
–
–
High Terminal of Resistor
Low Terminal of Resistor
Wiper Terminal of Resistor
Up/Down Control
H
L
W
U/D
INC
CS
Wiper Movement Control
Chip Select for Wiper Movement
No Connection
NC
V
CC
+5 Volts
GND
Ground
V
B
0 to –5 Volts
DESCRIPTION
The DS1666 is a solid–state potentiometer which is set
to value by digitally controlled resistive elements. The
potentiometer is composed of 127 resistive sections.
Betweeneach resistive section and both ends of the po-
tentiometerare TAP points accessible to the wiper. The
positionofthewiperontheresistancearrayiscontrolled
bytheCS, U/DandINCinputs. Thepositionofthewiper
defaults to the 10% position on power up. The resolu-
tion of the DS1666 is shown in Figure 1.
TheDS1666DigitalAudioResistorisuniquelydesigned
toprovideapotentiometerthatislogarithmicratherthan
linear across its entire range. The lower half of the po-
tentiometer advances 1% of total resistance for each
3% of scale advanced, providing for precise amplifica-
tion of low volume signals. The upper half of the poten-
tiometer advances 2% of resistance for every 1% of
scale advanced, providing for the lower resolution gain
required for high volume amplification.
022698 1/7
DS1666, DS1666S
GRAPH OF AUDIO TAPER Figure 1
100
90
80
70
60
50
40
30
20
1
2
3
1
10
0
0
10
20
30
40
50
60
70
80
90
100
HIGH TERMINAL
% OF ACTIVE DIGITAL TAPS
LOW TERMINAL
OPERATION
ANALOG CHARACTERISTICS
End–to–End Resistance Tolerance = ±20 percent
Typical Noise = <120 dB/Hz REF:IV
Temperature Coefficient = ±800 PPM/°C typical
The CS, U/D and INC inputs control the position of the
wiper along the resistor array (Figure 1). When CS is ac-
tive (low), a high to low transition on the INC will incre-
ment or decrement an internal counter depending on the
level of the U/D pin. When the U/D pin is low, the counter
will decrement. When the U/D pin is high, the counter will
increment. The state of the U/D pin canbe changed while
CS is active allowing for precise adjustment during cali-
bration. The output of the counter is decoded to set the
position of the wiper. When the CS input transitions to the
high (inactive) level, the value of the counter is stored and
Resistance at tap #74=18% ± 2% of total resistance.
PIN DESCRIPTIONS
V
V
V
The high end of the potentiometer. This
terminal is capable of handling input volt-
ages between ±5 volts.
H
The Low end of the potentiometer. This
terminal is capable of handling input volt-
ages between ±5 volts.
L
the wiper position is maintained until power (V ) is lost.
CC
When power is restored, the DS1666 returns to the de-
fault setting and positions the wiper to 10 percent. The
value of the end–to–end and end–to–wiper position is in-
The wiper terminal of the potentiometer.
The value of the wiper is controlled by the
U/D and the INC pins.
W
determinate while V is not applied.
CC
Up/Down
(U/D)
The U/D input controls the direc-
tion of the wiper movement when setting
the potentiometer.
The DS1666 has a resistor array that resembles an au-
dio taper potentiometer as shown in Figure 1 1. Since
the taper is not linear, exact resistance values for each
of the 128 positions of the resistor is not specified. How-
ever, the end-to-end resistance is specified to be within
±20 percent of the stated resistor value over an indus-
trial temperature range of –40°C to +85°C.
Increment Toggling INC will move the potentiome-
(INC)
ter wiper by either incrementing or decre-
menting the counter.
Chip Select The device is selected when CS input is
(CS)
low. The current counter value is stored
when CS is returned high.
022698 2/7
DS1666, DS1666S
BLOCK DIAGRAM Figure 2
TRANSFER LOGIC
ARRAY
V
H
WIPER
POSITION
DECODE
U/D
INC
7 BIT
1 OF 128
COUNTER
CS
V
V
L
W
MODE SELECTION Figure 3
CS
L
INC
U/D
MODE
H
WIPER UP
L
L
WIPER DOWN
H
X
STORE WIPER POSITION
022698 3/7
DS1666, DS1666S
ABSOLUTE MAXIMUM RATINGS*
Voltage on CS, INC, U/D, and V Relative to Ground –0.5V to +7.0V
CC
Voltage on V , V , and V Relative to Ground
–6.5V to +6.5V
H
L
W
Voltage on V
–6.5V to Ground
–40°C to +85°C
–55°C to +125°C
260°C for 10 seconds
B
Operating Temperature
Storage Temperature
Soldering Temperature
* This is a stress rating only and functional operation of the device at these or any other conditions above those
indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
(–40°C to +85°C)
PARAMETER
Supply Voltage
Input Logic 1
Input Logic 0
SYMBOL
MIN
+4.5
2.0
TYP
MAX
UNITS
NOTES
V
CC
5.0
5.5
V
V
V
V
V
1
1
1
1
1
V
IH
V
+0.5
CC
V
IL
–0.5
+0.8
V , V , V Voltage
V
R
V –0.3
B
V
+0.3
CC
H
B
L
W
V
Voltage
V
B
–5.5
GND
DC ELECTRICAL CHARACTERISTICS
(–40°C to +85°C; VCC = 5.0V ± 10%)
PARAMETER
Supply Current
Input Leakage
Wiper Resistance
Wiper Current
SYMBOL
MIN
TYP
MAX
UNITS
mA
µA
NOTES
I
0.1
5
3
2
CC
I
LI
–1
+1
650
1
R
W
350
Ω
I
W
mA
3
CAPACITANCE
PARAMETER
Capacitance
(tA = 25°C)
NOTES
2
SYMBOL CONDITION
t =25°C
TYP
MAX
UNITS
C
6
10
pF
IN
A
022698 4/7
DS1666, DS1666S
AC ELECTRICAL CHARACTERISTICS
(tA=–40°C to +85°C; VCC=+5V ± 10%)
PARAMETER
SYMBOL
MIN
100
100
1
TYP
MAX
UNITS
NOTES
CS to INC Setup
t
CI
t
ID
t
DI
ns
INC High to U/D Change
U/D to INC Setup
INC Low Period
ns
µs
t
500
1
ns
IL
IH
IC
INC High Period
t
t
µs
INC Inactive to CS Inactive
CS Deselect Time
500
100
ns
t
ns
CPH
AC TIMING Figure 4
CS
t
CPH
t
CI
t
IL
t
IC
t
IH
INC
t
ID
t
DI
U/D
t
IW
V
V
VH
VL
V
W
NOTES:
1. All voltages are referenced to ground.
2. This parameter is periodically sampled and not 100% tested.
3. Typical values are for t = 25°C and nominal supply voltages.
A
4. Wiper output open circuited.
AC TEST CONDITIONS
Input Pulse Levels
Input Rise and Fall Times
Input Level
0V to 3V
10 ns
1.5V
022698 5/7
DS1666, DS1666S
DS1666 ORDERING INFORMATION
OPERATING
TEMPERATURE
ORDERING NUMBER
DS1666–010
PACKAGE
VERSION
14L DIP
–40°C TO +85°C
–40°C TO +85°C
–40°C TO +85°C
–40°C TO +85°C
–40°C TO +85°C
–40°C TO +85°C
10KΩ
50KΩ
100KΩ
10KΩ
50KΩ
100KΩ
DS1666–050
14L DIP
DS1666–100
14L DIP
DS1666S–010
DS1666S–050
DS1666S–100
16L SOIC (300 MIL)
16L SOIC (300 MIL)
16L SOIC (300 MIL)
022698 6/7
DS1666, DS1666S
DATA SHEET REVISION SUMMARY
The following represent the key differences between 07/26/93 and 06/18/97 version of the DS1666 data sheet.
Please review this summary carefully.
1. Remove commercial temp grade reference
2. Add order info table
022698 7/7
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