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PDF LTC1069-6 Data sheet ( Hoja de datos )
| Número de pieza | LTC1069-6 | |
| Descripción | Single Supply/ Very Low Power/ Elliptic Lowpass Filter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1069-6
Single Supply, Very Low
Power, Elliptic Lowpass Filter
FEATURES
n 8th Order Elliptic Filter in SO-8 Package
n Single 3V Operation: Supply Current: 1mA (Typ)
fCUTOFF: 14kHz (Max) S/N Ratio: 72dB
n Single 5V Operation: Supply Current: 1.2mA (Typ)
fCUTOFF: 20kHz (Max) S/N Ratio: 79dB
n ± 0.1dB Passband Ripple Up to 0.9fCUTOFF (Typ)
n 42dB Attenuation at 1.3fCUTOFF
n 66dB Attenuation at 2.0fCUTOFF
n 70dB Attenuation at 2.1fCUTOFF
n Wide Dynamic Range, 75dB or More (S/N + THD),
Under Single 5V Operation
n Wideband Noise: 120µVRMS
n Clock-to-fCUTOFF Ratio: 50:1
n Internal Sample Rate: 100:1
APPLICATIONS
n Handheld Instruments
n Telecommunication Filters
n Antialiasing Filters
n Smoothing Filters
n Audio
n Multimedia
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
DESCRIPTION
The LTC®1069-6 is a monolithic low power, 8th order lowpass
filter optimized for single 3V or single 5V supply operation.
The LTC1069-6 typically consumes 1mA under single 3V
supply operation and 1.2mA under 5V operation.
The cutoff frequency of the LTC1069-6 is clock tunable and it is
equal to the clock frequency divided by 50. The input signal is
sampled twice per clock cycle to lower the risk of aliasing.
The typical passband ripple is ± 0.1dB up to 0.9fCUTOFF.
The gain at fCUTOFF is –0.7dB. The transition band of the
LTC1069-6 features progressive attenuation reaching
42dB at 1.3fCUTOFF and 70dB at 2.1fCUTOFF. The maximum
stopband attenuation is 72dB.
The LTC1069-6 can be clock tuned for cutoff frequencies
up to 20kHz (single 5V supply) and for cutoff frequencies
up to 14kHz (single 3V supply).
The low power feature of the LTC1069-6 does not penalize
the device’s dynamic range. With single 5V supply and
an input range of 0.4VRMS to 1.4VRMS, the Signal-to-
(Noise + THD) ratio is ≥70dB. The wideband noise of the
LTC1069-6 is 125μVRMS.
Other filter responses with higher speed can be obtained.
Please contact LTC Marketing for details.
The LTC1069-6 is available in an 8-pin SO package.
TYPICAL APPLICATION
Single 3V Supply 10kHz Elliptic Lowpass Filter
0.47μF
3V
0.1μF
AGND
VOUT
V+ V–
LTC1069-6
NC NC
VIN CLK
fCLK = 500kHz
1069-6 TA01
Frequency Response
10
VIN = 500mVRMS
0
–10
–20
–30
– 40
– 50
– 60
–70
– 80
5
10 15 20
FREQUENCY (kHz)
25
1069-6 TA02
10696fa
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1069-6
Dynamic Range THD + Noise
vs Input/Output Voltage
– 40
fCLK = 170kHz
–45 fCUTOFF = 3.4kHz
–50 fIN = 1kHz
–55 VIN = 2.945VP-P
– 60
– 65
–70
–75
– 80
– 85
– 90
0.1
13
INPUT/OUTPUT VOLTAGE (VP-P)
1069-6 G14
Dynamic Range THD + Noise
vs Input Voltage
– 40
– 45
fCLK = 500kHz
fIN = 1kHz
– 50
– 55
VS = SINGLE 3V
–60
–65
–70
VS =
SINGLE 5V
–75
– 80
– 85
– 90
0.1
0.5 0.76 1 1.43
INPUT VOLTAGE (VRMS)
5
1069-6 G10
THD + Noise vs Frequency
– 40
fCLK = 500kHz
–45 fCUTOFF = 10kHz
– 50
– 55
–60
VS = SINGLE 3V
VIN = 0.5VRMS
–65
–70
–75 VS = SINGLE 5V
–80 VIN = 1VRMS
– 85
– 90
1
5
FREQUENCY (kHz)
10
1069-6 G11
Supply Current vs Supply Voltage
5
4
3
85°C
25°C
2
–40°C
1
0
0 2 4 6 8 10 12 14 16
TOTAL SUPPLY VOLTAGE (V)
1069-6 G12
Output Voltage Swing
vs Temperature
RL = 10k
4.5
4.0
2.5
2.0
VS = SINGLE 5V
VS = SINGLE 3V
80
60
VS = SINGLE 3V
40
20
0 VS = SINGLE 5V
–40 –20 0 20
40
60
AMBIENT TEMPERATURE (°C)
80
1069-6 G13
PIN FUNCTIONS
AGND (Pin 1): Analog Ground. The quality of the analog
signal ground can affect the filter performance. For either
single or dual supply operation, an analog ground plane
surrounding the package is recommended. The analog
ground plane should be connected to any digital ground
at a single point. For single supply operation, Pin 1 should
be bypassed to the analog ground plane with a 0.47μF
capacitor or larger. An internal resistive divider biases
Pin 1 to 0.4366 times the total power supply of the device
(Figure 1). That is, with a single 5V supply, the potential
at Pin 1 is 2.183V ±1%. As the LTC1069-6 is optimized
1
AGND
2 V+
VOUT
V–
8
7
11.325k 8.775k
3
NC
6
NC
4 LTC1069-6 5
VIN CLK
1069-6 F01
Figure 1. Internal Biasing of the Analog Ground (Pin 1)
10696fa
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LTC1069-6.PDF ] | |
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