LTC1608
High Speed, 16-Bit, 500ksps
Sampling A/D Converter
with Shutdown
FEATURES
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DESCRIPTIO
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A Complete, 500ksps 16-Bit ADC
90dB S/(N+D) and 鈥?00dB THD (Typ)
Power Dissipation: 270mW (Typ)
No Pipeline Delay
No Missing Codes Over Temperature
Nap (7mW) and Sleep (10
碌
W) Shutdown Modes
Operates with Internal 15ppm/擄C Reference
or External Reference
True Differential Inputs Reject Common Mode Noise
5MHz Full Power Bandwidth
鹵2.5V
Bipolar Input Range
36-Pin SSOP Package
Pin Compatible with the LTC1604
The LTC
廬
1608 is a 500ksps, 16-bit sampling A/D con-
verter that draws only 270mW from
鹵5V
supplies. This
high performance device includes a high dynamic range
sample-and-hold, a precision reference and a high speed
parallel output. Two digitally selectable power shutdown
modes provide power savings for low power systems.
The LTC1608鈥檚 full-scale input range is
鹵
2.5V. Outstand-
ing AC performance includes 90dB S/(N+D) and 鈥?100dB
THD at a sample rate of 500ksps.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 15MHz
bandwidth. The 68dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has
碌P
compatible,16-bit parallel output port.
There is no pipeline delay in conversion results. A separate
convert start input and a data ready signal (BUSY) ease
connections to FlFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Circuitry in the LTC1608 is covered under US Patent #5,764,175
APPLICATIO S
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Telecommunications
Digital Signal Processing
Multiplexed Data Acquisition Systems
High Speed Data Acquisition
Spectrum Analysis
Imaging Systems
TYPICAL APPLICATIO
2.2碌F
10碌F
10鈩?/div>
36
3
V
REF
5V 10碌F
5V
10碌F
+
35
AV
DD
+
9
+
10
DGND
SHDN
33
AV
DD
DV
DD
LTC1608
4
REFCOMP
7.5k
1.75X
2.5V
REF
22碌F
BUSY
27
OV
DD
29
5V OR
3V
10碌F
AMPLITUDE (dB)
+
CONTROL
LOGIC
AND
TIMING
CS
32
CONVST
31
RD
30
碌P
CONTROL
LINES
+
1
A
IN
DIFFERENTIAL
ANALOG INPUT
鹵
2.5V
+
鈥?/div>
OGND 28
16-BIT
SAMPLING
ADC
AGND
5
AGND
6
B15 TO B0
OUTPUT
BUFFERS
16-BIT
PARALLEL
BUS
11 TO 26
1608 TA01
2
A
IN鈥?/div>
D15 TO D0
AGND
7
AGND V
SS
8
34
+
鈥?V
10碌F
U
LTC1608 4096 Point FFT
0
鈥?0
鈥?0
鈥?0
鈥?0
鈥?00
鈥?20
鈥?40
0
50
150
FREQUENCY (kHz)
100
200
250
1608 TA02
+
U
U
f
SAMPLE
= 500kHz
f
IN
= 98.754kHz
SINAD = 86.7dB
THD = 鈥?2.6dB
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