LTC1594_15 Datasheet, PDF (6/24 Pages) Linear Technology – 4- and 8-Channel, Micropower Sampling 12-Bit Serial I/O A/D Converters

LTC1594/LTC1598
TYPICAL PERFORMANCE CHARACTERISTICS
Attenuation vs Input Frequency
0
10
20
30
40
50
60
70
80 _{TA = 25°C}
90 ^{VCC = VREF = 5V}
f_SMPL = 16.8kHz
100
1
10
100
1000
INPUT FREQUENCY (kHz)
10000
1594/98 G13
4096 Point FFT Plot
0
T_A = 25°C
–20
V_CC = V_REF = 5V
f_IN = 5kHz
f_CLK = 320kHz
–40 f_SMPL = 12.5kHz
–60
–80
– 1 00
– 1 20
– 1 40
01
2 34 5
FREQUENCY (kHz)
67
1594/98 G14
Intermodulation Distortion
0
T_A = 25°C
–20
V_CC = V_REF = 5V
f₁ = 5kHz
f₂ = 6kHz
– 40 f_SMPL = 12.5kHz
– 60
–80
– 1 00
– 1 20
– 1 40
01
2 34 5
FREQUENCY (kHz)
67
1594/98 G15
Power Supply Feedthrough
vs Ripple Frequency
0
T_A = 25°C
V_CC = 5V (V_RIPPLE = 20mV)
V_REF = 5V
f_CLK = 320kHz
– 50
– 1 00
1
10
100
1000
RIPPLE FREQUENCY (kHz)
10000
1594/98 G16
Maximum Clock Frequency
vs Source Resistance
360
300
240
V_IN
+ INPUT
180
COM
120
R_SOURCE–
60
T_A = 25°C
V_CC = V_REF = 5V
0
0.1
1
10
SOURCE RESISTANCE (kΩ)
1594/98 G17
Sample-and-Hold Acquisition Time
vs Source Resistance
10000
T_A = 25°C
V_CC = V_REF = 5V
1000
100
0.1
R_SOURCE+
V_IN
+ INPUT
COM
1
10 100 1000 10000
SOURCE RESISTANCE (Ω)
1594/98 G18
Minimum Clock Frequency for
0.1LSB Error vs Temperature
320
V_CC = V_REF = 5V
240
Input Channel Leakage Current
vs Temperature
1000
V_CC = 5V
V_REF = 5V
100
10
160
ON CHANNEL
1
80
OFF CHANNEL
0.1
0
– 55 – 35 –15 5 25 45
TEMPERATURE (°C)
65 85
1594/98 G19
0.01
– 60 – 40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
1594/98 G20
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