LTC1608 Datasheet, PDF (1/20 Pages) Linear Technology – High Speed, 16-Bit, 500ksps Sampling A/D Converter with Shutdown

LTC1608
High Speed, 16-Bit, 500ksps
Sampling A/D Converter
with Shutdown
FEATURES
s _{A Complete, 500ksps 16-Bit ADC}
s _{90dB S/(N+D) and –100dB THD (Typ)}
s _{Power Dissipation: 270mW (Typ)}
s _{No Pipeline Delay}
s _{No Missing Codes Over Temperature}
s _{Nap (7mW) and Sleep (10µW) Shutdown Modes}
s _{Operates with Internal 15ppm/°C Reference}
or External Reference
s _{True Differential Inputs Reject Common Mode Noise}
s _{5MHz Full Power Bandwidth}
s _{±2.5V Bipolar Input Range}
s _{36-Pin SSOP Package}
s _{Pin Compatible with the LTC1604}
U
APPLICATIO S
s _{Telecommunications}
s _{Digital Signal Processing}
s _{Multiplexed Data Acquisition Systems}
s _{High Speed Data Acquisition}
s _{Spectrum Analysis}
s _{Imaging Systems}
DESCRIPTIO
The LTC^®1608 is a 500ksps, 16-bit sampling A/D con-
verter that draws only 270mW from ±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’s full-scale input range is ± 2.5V. Outstand-
ing AC performance includes 90dB S/(N+D) and – 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 µP 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
TYPICAL APPLICATIO
+
22µF
DIFFERENTIAL
ANALOG INPUT
± 2.5V
2.2µF
3
V_REF
10µF
5V 10µF
10Ω
+
36
35
AV_DD AV_DD
LTC1608
4 ^REFCOMP
1.75X
7.5k _2.5V
REF
5V 10µF
+
9
10
DV_DD
DGND
SHDN 33
CONTROL
LOGIC
AND
TIMING
CS 32
CONVST 31
RD 30
BUSY 27
µP
CONTROL
LINES
1 ^AIN+
2 AIN–
16-BIT
SAMPLING
ADC
B15 TO B0
OUTPUT
BUFFERS
AGND AGND AGND AGND V_SS
5
6
7
8 34
OV_{DD 29}
OGND 28
5V OR
3V
10µF
D15 TO D0
16-BIT
PARALLEL
BUS
11 TO 26
1608 TA01
+ ^10µF
–5V
LTC1608 4096 Point FFT
0
f_SAMPLE = 500kHz
–20
f_IN = 98.754kHz
SINAD = 86.7dB
THD = –92.6dB
–40
–60
–80
–100
–120
–140
0
50 100 150 200 250
FREQUENCY (kHz)
1608 TA02
1