LTC1564 Datasheet PDF - Linear

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LTC1564
Linear

Part Number LTC1564
Description 10kHz to 150kHz Digitally Controlled Antialiasing Filter and 4-Bit P.G.A
Page 12 Pages


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LTC1564
10kHz to 150kHz
Digitally Controlled
Antialiasing Filter and 4-Bit P.G.A
FEATURES
s 4-Bit Digitally Controlled 8th-Order Lowpass Filter
– fCUTOFF Adjustable from 10kHz to 150kHz in 10kHz
Steps
– 100dB Attenuation at 2.5 × fCUTOFF
s 4-Bit Digitally Controlled Programmable Gain
Amplifier
– G = 1 to 16 in 1V/V Steps
s Miniature 16-Pin SSOP Package
s No External Components
s 122dB Total System Dynamic Range
s Rail-to-Rail Input and Output Range
s 2.7V to 10V Operation
s Low Noise Mute Mode
s Low Power Shutdown Mode
U
APPLICATIO S
s Antialias or Reconstruction Filtering
s DSP Systems
s Communications Systems
s Scientific Instruments
s High Resolutions (16 Bits to 20 Bits)
s Processing Signals Buried in Noise
s Audio Signal Processing
s Programmable Data Rates
s Automatic Gain Control (AGC)
s Single Part Replacing Multiple Filters
DESCRIPTIO
The LTC®1564 is a new type of continuous time filter for
antialiasing, reconstruction and other band-limiting appli-
cations. No other analog components or filter expertise are
needed to use it. There is one analog input pin and one
analog output pin. The cutoff frequency (fC) and gain are
programmable while the shape of the lowpass response is
fixed. A latching digital interface stores fC and gain settings
or it can be bypassed for control directly from the pins. The
LTC1564 operates from 2.7V to 10V total (single or split
supplies) and comes in a 16-pin surface mount SSOP.
The LTC1564 is a rail-to-rail high resolution 8th-order
lowpass filter with two stopband notches, giving approxi-
mately 100dB attenuation at 2.5 times the passband cutoff
frequency fC (a de-facto standard for DSP front ends).
Signals with low or variable levels can be normalized with
the built-in variable gain that reduces input-referred noise
with increasing gain for a typical dynamic range (maxi-
mum signal level to minimum noise) of 122dB (20 equiva-
lent bits) with 20kHz fC and 118dB at 100kHz fC on a ±5V
supply.
Other frequency-response shapes can be provided upon
request. Please contact LTC Marketing.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Low Noise Programmable Filter with Variable Gain
ANALOG
IN
V+
0.1µF
GAIN CODE
16 15 14 13 12 11 10 9
IN AGND V+ RST G3 G2 G1 G0
LTC1564
CS/
OUT VEN HOLD F3 F2 F1 F0
1 2 34 5 6 7 8
V+ AND VSUPPLIES CAN BE FROM
1.35V TO 5.25V EACH
TIE F AND G PINS TO V+ OR VTO
SET FREQUENCY AND GAIN
DYNAMIC RANGE 118dB TO 122dB
AT ± 5V DEPENDING ON FREQUENCY CODE
ANALOG
OUT
0.1µF
FREQUENCY CODE
V1564 TA01
LTC1564 Programmable Range
30
20
10
0
–10
–20
–30
–40
–50
–60
–70 fC = 10kHz
–80 GAIN = 1V/V
–90
–100
–110
–120
5
10
fC = 150kHz
GAIN = 16V/V
100
FREQUENCY (kHz)
500
1564 TA02
1
Free Datasheet http://www.datasheet4u.com/



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LTC1564
ABSOLUTE AXI U RATI GS
(Note 1)
Total Supply Voltage (V+ to V) .............................. 11V
Input Voltage ............................. V+ + 0.3V to V– 0.3V
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range
LTC1564C .............................................. 0°C to 70°C
LTC1564I .......................................... – 40°C TO 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
OUT 1
V2
EN 3
CS/HOLD 4
F3 5
F2 6
F1 7
F0 8
TOP VIEW
16 IN
15 AGND
14 V+
13 RST
12 G3
11 G2
10 G1
9 G0
ORDER PART
NUMBER
LTC1564CG
LTC1564IG
G PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/ W
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = ±2.375V, fC = 10kHz, gain = 1, RL = 10k, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Total Supply Voltage
2.7 10.5 V
Supply Current
Output Voltage Swing
Output Short-Circuit Current
DC Offset Voltage Magnitude (Referred to Input)
VS = ±1.35V, VIN = 0V
VS = ±2.375V, VIN = 0V
VS = ±5V, VIN = 0V
RL = 10k to 0V
VS = ±5V
Gain = 1, 0°C to 70°C
Gain = 1, – 40°C to 85°C
Gain = 10, 0°C to 70°C
Gain = 10, – 40°C to 85°C
q
q
q
q 4.5
q
q
q
q
q
15 17
16 18.5
22 25
4.65
±10
3 13
3 16
15
16
mA
mA
mA
VP-P
mA
mV
mV
mV
mV
DC AGND Reference Voltage
Passband Gain
Passband Ripple
Roll Off at Cutoff Frequency (fC) (Note 3)
Roll Off at 2fC (Note 3)
Roll Off at 2.5fC (Note 3)
Wideband Noise (Referred to Input)
Total Harmonic Distortion
Input Impedance
Output Impedance
Mute State (F = 0000) Gain
VS = Single 5V Supply
fC = 50kHz, fIN = 10kHz, Gain = 1
fC = 50kHz, fIN = 10KHz, Gain = 16
fC = 10kHz, 0 fIN 9kHz (Notes 2, 3)
fC = 150kHz, 0 fIN 135kHz (Notes 2, 3)
fC = 10kHz (F = 0001)
fC = 150kHz (F = 1111)
fC = 10kHz
fC = 10kHz
BW = 20kHz, fC = 10kHz, Gain = 1
BW = 20kHz, fC = 10kHz, Gain = 16
BW = 200kHz, fC = 100kHz, Gain = 1
fC = 100kHz, fIN = 10kHz, VIN = 1VRMS
Gain = 1, DC VIN = 0V
Gain = 16, DC VIN = 0V
fC = 10kHz, f = 10kHz
F = 0000, fIN = 20kHz, VIN = 1VRMS
2.5 V
q – 0.1
0.3
0.8
q 23.5 24.2 25.3
dB
dB
q –0.5
q – 0.6
0.5 dB
1.6 dB
q –1.2 –0.7 –0.3
q –1.5 –0.5
0.6
dB
dB
q –65 –62 –59
dB
–99 dB
33 µVRMS
2.5 µVRMS
50 µVRMS
– 86 dB
10 k
625
30
–103 dB
2



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LTC1564
ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VS = ±2.375V, fC = 10kHz, gain = 1, RL = 10k, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Mute State Output Noise
Shutdown Supply Current
Digital Input “High” Voltage
Digital Input “Low” Voltage
Digital Input Pull-Up or Pull-Down Current (Note 5)
(Digital Inputs Other than EN)
Digital Input Pull-Up Current (EN Input)
F = 0000, BW = 200kHz
VS = ±1.35V, EN to V+
VS = ±1.35V, EN to V+
VS = ±2.375V, EN to V+
VS = ±2.375V, EN to V+
VS = ±5V, EN to V+ (Note 4)
VS = ±1.35V
VS = ±2.375V
VS = ±5V
VS = ±1.35V
VS = ±2.375V
VS = ±5V
VS = ±1.35V
VS = ±5V
VS = ±1.35V
VS = ±5V
q
q
1.08
1.90
4.50
q
q
q
q
5.4 µVRMS
45 75
150
µA
µA
100 150
180
µA
µA
175 µA
V
V
V
–1.08
–1.90
0.50
V
V
V
3.5 6
13 20
µA
µA
12
10 20
µA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Response is tested in production at discrete frequencies fIN of 0.1,
0.5, 0.8 and 0.9 times fC.
Note 3: Relative to gain at 0.1fC.
Note 4: All digital inputs driven rail-to-rail. When driving digital inputs with
0V and 5V levels, the shutdown current will increase to 3.5mA (typ).
Note 5: Each digital input includes a small positive or negative current
source to float the CMOS input to V+ or Vpotential if it is unconnected.
The table shows the current due to this source when the input is driven at
the supply voltage opposite from the float potential. Pins CS/HOLD, F3, F2,
F0 and G3 to G0 float to the Vvoltage, pins RST, EN and F1 to the V+
voltage. See “Floatable Digital Inputs” in Applications Information section.
TYPICAL PERFOR A CE CHARACTERISTICS
Overall Frequency Response
(Frequency Scales Normalized to fC)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0.1
VS = SINGLE 5V
UNITY GAIN
(G CODE 0000)
fC = 50kHz
fC = 150kHz
fC = 10kHz
1
fIN/fC
10
1564 G01
Roll-Offs Over Temperature
(fC = 10kHz)
5
fC = 10kHz
SINGLE 5V SUPPLY
–40°C, 25°C, 85°C
0
–5
–10
5
6.25 7.5 8.75 10 11.25 12.5
FREQUENCY (kHz)
1564 G02
Roll-Offs Over Temperature
(fC = 100kHz)
5
fC = 100kHz
SINGLE 5V SUPPLY
0
–40°C 85°C
25°C
–5
–10
50 62.5 75 87.5 100 112.5 125
FREQUENCY (kHz)
1564 G03
3



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LTC1564
TYPICAL PERFOR A CE CHARACTERISTICS
Passband Roll-Off at fIN = fC
vs fC
0
VS = SINGLE 5V
TA = 25°C
–0.25
–0.50
–0.75
–1.00
–1.25
–1.50
10 30 50 70 90 110 130 150
fC (kHz)
1564 G04
Passband Gain, Phase
and Group Delay
5
fC = 10kHz
0
–5
GAIN
90
0
–90
–10 –180
PHASE
–15 –270
–20 –360
–25 –450
–30
GROUP DELAY
–35
–540
–630
–40 –720
–45
2
4 6 8 10
FREQUENCY (kHz)
–810
12
1546 G06
500
450
400
350
300
250
200
150
100
50
0
Detail of Stopband Response
–40
fC = 10kHz
–50 VS = ±5V
–60 TA = 25°C
–70
–80
–90
–100
–110
–120
–130
–140
15
25 35 45 55
FREQUENCY (kHz)
65
1564 G05
Triangular-Wave Time Response
INPUT
fC = 10kHz
fIN = 1kHz
UNITY GAIN
VS = ± 5V
OUTPUT
200µs/DIV
1564 G09
Rectangular Pulse Response
fC = 10kHz
UNITY GAIN
VS = ±5V
INPUT
OUTPUT
200µs/DIV
1564 G07
SNR vs Input Voltage
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.001
LIMIT FOR 10V TOTAL SUPPLY
LIMIT FOR 5V TOTAL SUPPLY
GAIN = 16
fC = 100kHz
GAIN = 16
fC = 20kHz
GAIN = 1
fC = 100kHz
GAIN = 1
fC = 20kHz
PASSBAND INPUT
(fIN < fC)
0.01 0.1
1
INPUT VOLTAGE (VP-P)
10
1564 G10
Short-Pulse Response
fC = 10kHz
UNITY GAIN
VS = ± 5V
INPUT, 1V/DIV (PULSE WIDTH 10µs)
OUTPUT, 100mV/DIV
100µs/DIV
1564 G08
THD + Noise vs Input Voltage
(fC = 10kHz)
–20
–30
3V SUPPLY
–40
5V SUPPLY
–50
±5V SUPPLY
–60
–70
–80
–90 fC = 10kHz
–100 fIN = 1kHz
0.001
0.01
0.1
1
INPUT VOLTAGE (VP-P)
10
1564 G11
4



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