LTC1608 LINER [Linear Technology], LTC1608 Datasheet - Page 19

• Manufacturer Part Number: LTC1608
• Description: High Speed, 16-Bit, 500ksps Sampling A/D Converter with Shutdown
• Manufacturer: LINER [Linear Technology]

APPLICATIO S I FOR ATIO
PACKAGE DESCRIPTIO
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
**
(.005 – .009)
*
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED .152mm (.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
.13 – .22
–100
–120
–140
–100
–110
–20
–40
–60
–80
Figure 22. Intermodulation Distortion Plot
–10
–20
–30
–40
–50
–60
–70
–80
–90
Figure 21. Distortion vs Input Frequency
(.205 – .212)
0
5.20 – 5.38**
0
1k
0
(.022 – .037)
MILLIMETERS
.55 – .95
(INCHES)
50
U
INPUT FREQUENCY (Hz)
10k
FREQUENCY (kHz)
100
U
0 – 8
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
150
(.0256)
f
f
f
BSC
.65
SAMPLE
IN1
IN2
100k
= 96.56kHz
= 99.98kHz
W
(.010 – .015)
200
= 500kHz
.25 – .38
U
1608 F22
THD
3RD
2ND
1608 F21
250
1M
(Reference LTC DWG # 05-08-1640)
36-Lead Plastic SSOP (5.3mm)
U
G Package
(fa
magnitude, the value (in decibels) of the 2nd order IMD
products can be expressed by the following formula:
Peak Harmonic or Spurious Noise
The peak harmonic or spurious noise is the largest spec-
tral component excluding the input signal and DC. This
value is expressed in decibels relative to the RMS value of
a full-scale input signal.
Full-Power and Full-Linear Bandwidth
The full-power bandwidth is that input frequency at which
the amplitude of the reconstructed fundamental is
reduced by 3dB for a full-scale input signal.
The full-linear bandwidth is the input frequency at which
the S/(N + D) has dropped to 84dB (13.66 effective bits).
The LTC1608 has been designed to optimize input band-
width, allowing the ADC to undersample input signals with
frequencies above the converter’s Nyquist Frequency. The
noise floor stays very low at high frequencies; S/(N + D)
becomes dominated by distortion at frequencies far
beyond Nyquist.
IMD fa fb
(.002 – .008)
.05 – .21
(.068 – .078)
1.73 – 1.99
fb). If the two input sine waves are equal in
36
1 2 3 4 5 6 7 8 9 10 11 12
35
20
34
33
Log
32
31
Amplitude
30
29
12.67 – 12.93*
(.499 – .509)
Amplitude at fa
28
27
26
25
13
24
at (fa
14 15 16 17 18
23
22 21 20 19
LTC1608
fb)
G36 SSOP 0501
(.301 – .311)
19
7.65 – 7.90