LTC1197 Linear Technology, LTC1197 Datasheet - Page 20

• Manufacturer Part Number: LTC1197
• Description: 10-Bit/ 500ksps ADCs in MSOP with Auto Shutdown
• Manufacturer: Linear Technology

LTC1197/LTC1197L
LTC1199/LTC1199L
Signal-to-Noise Ratio
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency to
the RMS amplitude of all other frequency components at
the A/D output. This includes distortion as well as noise
products and for this reason it is sometimes referred to
as signal-to-noise + distortion [S/(N + D)]. The output is
band limited to frequencies from DC to one half the
sampling frequency. Figure 9 shows spectral content
from DC to 250kHz which is 1/2 the 500kHz sampling
rate.
20
A
PPLICATI
O
U
S
I FOR ATIO
U
Figure 9. This Clean FFT of a 97kHz Input Shows Remarkable
Performance for an ADC Sampling at the 500kHz Rate
W
–100
Figure 10. Dynamic Accuracy is Maintained
Up to an Input Frequency of 200kHz for the
LTC1197 and 50kHz for the LTC1197L
– 20
– 30
– 80
– 90
–10
– 40
– 50
– 60
– 70
10
2
1
0
0
9
8
7
6
5
4
3
1
0
U
50
10
FREQUENCY (kHz)
FREQUENCY (kHz)
f
SMPL
100
f
V
SMPL
CC
= 250kHz
f
f
= 2.7V
SMPL
IN
150
= 500kHz
Effective Number of Bits
The effective number of bits (ENOBs) is a measurement of
the resolution of an ADC and is directly related to the
S/(N + D) by the equation:
where S/(N + D) is expressed in dB. At the maximum
sampling rate of 500kHz the LTC1197 maintains 9.5
ENOBs or better to 200kHz. Above 200kHz the ENOBs
gradually decline, as shown in Figure 10, due to increasing
second harmonic distortion. The noise floor remains
approximately 100dB.
V
= 97.045898kHz
CC
100
ENOB = [S/(N + D) –1.76]/6.02
= 500kHz
= 5V
200
1197/99 G07
1197/99 G06
1000
250