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PDF LTC1605CG Data sheet ( Hoja de datos )
| Número de pieza | LTC1605CG | |
| Descripción | 16-Bit/ 100ksps/ Sampling ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Sample Rate: 100ksps
s Single 5V Supply
s Bipolar Input Range: ±10V
s Power Dissipation: 55mW Typ
s Integral Nonlinearity: ±2.0LSB Max
s Guaranteed No Missing Codes
s Signal-to-Noise Ratio: 86dB Typ
s Operates with Internal or External Reference
s Internal Synchronized Clock
s 28-Pin 0.3” PDIP, SSOP and SW Packages
s Improved 2nd Source to ADS7805 and AD976
U
APPLICATIONS
s Industrial Process Control
s Multiplexed Data Acquisition Systems
s High Speed Data Acquisition for PCs
s Digital Signal Processing
LTC1605
16-Bit, 100ksps,
Sampling ADC
DESCRIPTION
The LTC®1605 is a 100ksps, sampling 16-bit A/D con-
verter that draws only 55mW (typical) from a single 5V
supply. This easy-to-use device includes sample-and-
hold, precision reference, switched capacitor successive
approximation A/D and trimmed internal clock.
The LTC1605’s input range is an industry standard ±10V.
Maximum DC specs include ±2.0LSB INL and 16-bits no
missing codes over temperature. An external reference
can be used if greater accuracy over temperature is
needed.
The ADC has a microprocessor compatible, 16-bit or two
byte parallel output port. A convert start input and a data
ready signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Low Power, 100kHz, 16-Bit Sampling ADC on 5V Supply
±10V 200Ω
INPUT
33.2k
2.2µF
2.2µF
1 VIN
4 CAP
3 REF
5V
28 27
VDIG VANA
20k
4k 10k
10µF
0.1µF
16-BIT
SAMPLING ADC
6 TO 13
15 TO 22
D15 TO D0
16-BIT
OR 2 BYTE
PARALLEL
BUS
BUFFER
4k
REFERENCE
CONTROL
LOGIC AND
TIMING
AGND1 AGND2 DGND
2 5 14
BUSY 26
CS 25
R/C 24
BYTE 23
DIGITAL
CONTROL
SIGNALS
1605 • TA01
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
Typical INL Curve
16384
32768
CODE
49152 65535
1605 • TA02
1
1 page  
LTC1605
ELECTRICAL CHARACTERISTICS
Note 11: With CS low the falling R/C edge starts a conversion. If R/C
returns high at a critical point during the conversion it can create small
errors. For best results ensure that R/C returns high within 3µs after the
start of the conversion.
Note 12: As measured with fixed resistors shown in Figure 4. Adjustable to
zero with external potentiometer.
Note 13: Full-scale error is the worst-case of –FS or +FS untrimmed
deviation from ideal first and last code transitions, divided by the transition
voltage (not divided by the full-scale range) and includes the effect of
offset error.
Note 14: All specifications in dB are referred to a full-scale ±10V input.
Note 15: Full-power bandwidth is defined as full-scale input frequency at
which a signal-to-(noise + distortion) degrades to 60dB or 10 bits of
accuracy.
Note 16: Recovers to specified performance after (2 • FS) input
overvoltage.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
12.5
fSAMPLE = 100kHz
12.0
11.5
11.0
10.5
10.0
9.5
4.50
4.75 5.00
5.25 5.50
SUPPLY VOLTAGE (V)
1605 • TPC01
Typical INL Curve
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384
32768
CODE
49152 65535
1605 • TPC04
Supply Current vs Temperature
12.0
fSAMPLE = 100kHz
11.5
11.0
10.5
10.0
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
1605 • TPC02
Change in CAP Voltage vs
Load Current
0.05
0.04
0.03
0.02
0.01
0
–0.01
–0.02
–0.03
–0.04
–0.05
–0.06
–0.07
–0.08
–0.09
–0.10
–80 –70 –60 –50 –40 –30 –20 –10
LOAD CURRENT (mA)
0
10
1605 • TPC03
Typical DNL Curve
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384
32768
CODE
49152 65535
1605 • TPC05
Power Supply Feedthrough vs
Ripple Frequency
– 20
– 30
– 40
– 50
– 60
– 70
1
10 100 1k 10k 100k 1M
RIPPLE FREQUENCY (Hz)
1605 • TPC06
5
5 Page 
LTC1605
APPLICATIONS INFORMATION
t10
R/C
t10
t10 t10
t1
CS
t1
BUSY
MODE
ACQUIRE
DATA BUS
t3
t4
t6
CONVERT
tCONV
ACQUIRE
HI-Z
t12
Figure 9. Using CS to Control Conversion and Read Timing
DATA
VALID
t7
HI-Z
1605 • F09
t10
R/C
t10
CS
BYTE
PINS 6 TO 13
PINS 15 TO 22
HI-Z
t12
HI-Z
HIGH BYTE
t12
LOW BYTE
LOW BYTE
t7
HIGH BYTE
HI-Z
HI-Z
Figure 10. Using CS and BYTE to Control Data Bus Read Timing
0
–10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
–100
–110
–120
–130
0
f SAMPLE =100kHz
f IN =1kHz
SINAD =87.5dB
THD =–101.7dB
5 10 15 20 25 30 35 40 45 50
FREQUENCY (kHz)
1605 • F11
Figure 11. LTC1605 Nonaveraged 4096 Point FFT Plot
1605 • F03
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1605CG.PDF ] | |
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