Datasheet

AD9277
Rev. 0 | Page 14 of 48
TYPICAL PERFORMANCE CHARACTERISTICS
TGC MODE
f
SAMPLE
= 50 MSPS, f
IN
= 5 MHz, R
S
= 50 Ω, LNA gain = 21.3 dB, LNA bias = high, PGA gain = 24 dB, AAF LPF cutoff = f
SAMPLE
/4.5,
HPF cutoff = LPF cutoff/20.7 (default).
–2.0
–1.5
–0.5
–1.0
0
0.5
1.0
1.5
2.0
0 0.2 0.4 0.6 0.8 1.0
GAIN+ (V)
GAIN ERROR (dB)
1.2 1.4 1.6
+85°C
+25°C
–40°C
08181-005
Figure 5. Gain Error vs. GAIN+ at Three Temperatures
0
5
10
15
20
25
–1.0 –0.9 –0.8 –0.7 –0.6 –0.5 –0.4 –0.3 –0.2 –0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
PERCENTAGE OF UNITS (%)
GAIN ERROR (dB)
08181-006
Figure 6. Gain Error Histogram, GAIN+ = 0.16 V
0
2
4
6
10
8
12
14
–1.0 –0.9 –0.8 –0.7 –0.6 –0.5 –0.4 –0.3 –0.2 –0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
PERCENTAGE OF UNITS (%)
GAIN ERROR (dB)
08181-007
Figure 7. Gain Error Histogram, GAIN+ = 0.8 V
0
5
10
15
20
25
–1.0 –0.9 –0.8 –0.7 –0.6 –0.5 –0.4 –0.3 –0.2 –0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
PERCENTAGE OF UNITS (%)
GAIN ERROR (dB)
08181-008
Figure 8. Gain Error Histogram, GAIN+ = 1.44 V
0
5
10
15
20
25
–1.25 –1.00 –0.75
PERCENTAGE OF UNITS (%)
–0.50 –0.25 0
CHANNEL-TO-CHANNEL GAIN MATCHING (dB)
0.25 0.50 0.75 1.00 1.25
08181-009
Figure 9. Gain Match Histogram, GAIN+ = 0.3 V
08181-010
5
0
10
15
20
25
–1.25 –1.00 –0.75
PERCENTAGE OF UNITS (%)
–0.50 –0.25 0
CHANNEL-TO-CHANNEL GAIN MATCHING (dB)
0.25 0.50 0.75 1.00 1.25
Figure 10. Gain Match Histogram, GAIN+ = 1.3 V