LTC6910-2_15 Datasheet, PDF (12/24 Pages) Linear Technology – Digitally Controlled Programmable Gain Amplifiers in SOT-23

LTC6910-1
LTC6910-2/LTC6910-3
TYPICAL PERFOR A CE CHARACTERISTICS (LTC6910-2)
LTC6910-2 Gain Shift
vs Temperature
0.2 _{VS = ± 2.5V}
OUTPUT UNLOADED
0.1
GAIN = 64
GAIN = 8
0
GAIN = 1
–0.1
–0.2
–50
0
50
100
TEMPERATURE (°C)
150
6910 G10
LTC6910-2 Frequency Response
50
V_S = ±5V
V_IN = 10mV_RMS
40 _{GAIN OF 64}
GAIN OF 32
30
GAIN OF 16
20 ^{GAIN OF 8}
GAIN OF 4
10 _{GAIN OF 2}
GAIN OF 1
0
–10
100
1k 10k 100k 1M 10M
FREQUENCY (Hz)
6910 G11
LTC6910-2 –3dB Bandwidth
vs Gain Setting
8.0
7.5 _•
7.0
6.5
6.0 •
V_IN = 10mV_RMS
• ^VS ^{= 2.7V}
• ^VS ^{= ±5V}
5.5
5.0
•
4.5
4.0
•
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1
•
•
••
•• _{• •}
10
100
GAIN
6910 G12
LTC6910-2 Output Voltage Swing
vs Load Current
+V_S
+V_S – 0.5
+V_S – 1.0
V_S = ±2.5V
125°C
25°C
–40°C
SOURCE
+V_S – 1.5
+V_S – 2.0
–V_S + 2.0
–V_S + 1.5
–V_S + 1.0
–V_S + 0.5
–V_S
0.01
SINK
0.1
1
10
OUTPUT CURRENT (mA)
100
6910 G13
LTC6910-2 Power Supply
Rejection vs Frequency
90
80
+SUPPLY
V_S = ±2.5V
GAIN = 1
70
60
–SUPPLY
50
40
30
20
10
0
0.1
1
10
100
1000
FREQUENCY (kHz)
6910 G14
LTC6910-2 Noise Density
vs Frequency
100
INPUT-REFERRED
V_S = ±2.5V
T_A = 25°C
GAIN = 1
GAIN = 8
10
GAIN = 64
1
1
10
100
FREQUENCY (kHz)
6910 G15
LTC6910-2 Distortion with Light
Loading (R_L = 10k)
–30
3
V_S = ±2.5V
–40
V_OUT = 1V_RMS (2.83V_P-P)
THD MEASURES HD2 AND HD3
1
–50
0.3
–60
GAIN = 64
–70
GAIN = 8
–80
GAIN = 1
–90
0.1
0.03
0.01
0.003
–100
0
50
100
150
FREQUENCY (kHz)
0.001
200
6910 G16
LTC6910-2 Distortion with Heavy
Loading (R_L = 500Ω)
–30
3
–40
1
GAIN = 64
–50
0.3
GAIN = 8
–60
0.1
–70
0.03
GAIN = 1
–80
0.01
–90 ^{VS = ±2.5V}
V_OUT = 1V_RMS (2.83V_P-P)
THD MEASURES HD2 AND HD3
–100
0
50
100
150
FREQUENCY (kHz)
0.003
0.001
200
6910 G17
LTC6910-2 THD + Noise
vs Input Voltage
–20
GAIN
–30 _{SETTING = 64}
–40
–50
–60
–70
GAIN
SETTING = 8
–80
–90
f_IN = 1kHz
–100 V_S = ±5V
NOISE BW = 22kHz
–110
0.01
0.1
GAIN SETTING = 1
1
10
INPUT VOLTAGE (V_P-P)
6910 G18
12
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