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PDF LTC1609 Data sheet ( Hoja de datos )
| Número de pieza | LTC1609 | |
| Descripción | Serial ADC | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1609 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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FEATURES
s Sample Rate: 200ksps
s Input Ranges
Unipolar: 0V to 10V, 0V to 5V and 0V to 4V
Bipolar: ±10V, ±5V and ±3.3V
s Guaranteed No Missing Codes
s Serial I/O
s Single 5V Supply
s Power Dissipation: 65mW Typ
s Power Down Mode: 50µW
s SNR: 87dB Typ
s Operates with Internal or External Reference
s 28-Pin SSOP and 20-Pin SO Packages
s Improved 2nd Source to ADS7809 and AD977A
U
APPLICATIO S
s Industrial Process Control
s Multiplexed Data Acquisition Systems
s High Speed Data Acquisition for PCs
s Digital Signal Processing
LTC1609
16-Bit, 200ksps, Serial ADC
with Multiple Input Ranges
DESCRIPTIO
The LTC®1609 is a 200ksps, serial sampling 16-bit A/D
converter that draws only 65mW (typical) from a single 5V
supply. This easy-to-use device includes a sample-and-
hold, a precision reference, a switched capacitor succes-
sive approximation A/D and trimmed internal clock.
The input range is specified for bipolar inputs of ±10V,
±5V and ±3.3V and unipolar inputs of 0V to 10V, 0V to 5V
and 0V to 4V. Maximum DC specs include ±2LSB INL and
16-bit no missing codes over temperature. It has a typical
signal-to-noise ratio of 87dB.
The ADC has a high speed serial interface. The serial
output data can be clocked out using either the internal
serial shift clock or be clocked out by an external shift
clock. A separate convert start input (R/C) and a data ready
signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
200kHz, 16-Bit Serial Sampling ADC Configured for ±10V Inputs
ANALOG INPUT
– 10V TO 10V
200Ω
100Ω
33.2k
2.5V
+ 2.5V
2.2µF +
2.2µF
1 28
R1IN
VDIG
2 27
AGND1
VANA
3 26
R2IN
PWRD
4 25
R3IN
BUSY
5 24
NC CS
6 LTC1609 23
CAP NC
7
REF
22
NC
8
NC
21
R/C
9
AGND2
20
NC
10
NC
19
TAG
11
NC
18
NC
12
SB/BTC
17
DATA
13 16
EXT/INT DATACLK
14
DGND
15
SYNC
+
10µF
0.1µF
5V
SERIAL INTERFACE
1609 TA01
Nonaveraged 4096 Point FFT Plot
0
fSAMPLE = 200kHz
–20
fIN = 1kHz
SINAD = 87.2dB
THD = –100.1dB
–40
–60
–80
–100
–120
–130
0
25 50 75
FREQUENCY (kHz)
100
1609 G06
1609fa
1
1 page  
LTC1609
POWER REQUIREMENTS The q indicates specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 5)
SYMBOL
VDD
IDD
PDIS
PARAMETER
Positive Supply Voltage
Positive Supply Current
Power Dissipation
CONDITIONS
(Notes 9, 10)
PWRD = Low
PWRD = Low
PWRD = High
LTC1609/LTC1609A
MIN TYP MAX
4.75 5.25
q 13 20
65 100
50
UNITS
V
mA
mW
µW
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND, AGND1
and AGND2 wired together (unless otherwise noted).
Note 3: When these pin voltages are taken below ground or above VANA =
VDIG = VDD, they will be clamped by internal diodes. This product can
handle input currents of greater than 100mA below ground or above VDD
without latch-up.
Note 4: When these pin voltages are taken below ground, they will be
clamped by internal diodes. This product can handle input currents of
90mA below ground without latchup. These pins are not clamped to VDD.
Note 5: VDD = 5V, fSAMPLE = 200kHz, tr = tf = 5ns unless otherwise
specified.
Note 6: Linearity, offset and full-scale specifications apply for a VIN input
with respect to ground.
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual end points of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 8: Bipolar zero error is the offset voltage measured from – 0.5 LSB
when the output code flickers between 0000 0000 0000 0000 and 1111
1111 1111 1111. Unipolar zero error is the offset voltage measured from
0.5LSB when the output codes flickers between 0000. . .0000 and 0000. .
.0001.
Note 9: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
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 1.2µs after the
start of the conversion.
Note 12: As measured with fixed 1% resistors shown in Figures 3a and
3b. 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. For unipolar input ranges full-scale error is the deviation of
the last code transition from ideal divided by the transiton voltage and
includes the effect of offset error.
Note 14: All specifications in dB are referred to a full-scale ±5V 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.
Note 17: When data is shifted out during a conversion, with an external
data clock, complete the process within 1.2µs from the start of the
conversion (BUSY falling). This will help keep any external disturbances
from causing an error in the conversion result.
1609fa
5
5 Page 
APPLICATIO S I FOR ATIO
INPUT RANGE
± 10V
WITHOUT TRIM
200Ω
VIN
100Ω
33.2k
++
2.2µF 2.2µF
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
LTC1609
WITH TRIM
(ADJUST OFFSET FIRST AT 0V, THEN ADJUST GAIN)
100Ω
5V
OFFSET
TRIM
50k
200Ω
VIN
33.2k
+
2.2µF
5V
GAIN
TRIM
50k
576k
+
2.2µF
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
± 5V
200Ω
100Ω
VIN
33.2k
++
2.2µF 2.2µF
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
200Ω
33.2k
100Ω
5V VIN
OFFSET
TRIM
50k
+
2.2µF
5V
GAIN
TRIM
50k
576k
+
2.2µF
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
± 3.3V
200Ω
VIN
100Ω
33.2k
++
2.2µF 2.2µF
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
200Ω
VIN
100Ω
5V
OFFSET
TRIM
50k
33.2k
+
2.2µF
5V
GAIN
TRIM
50k
576k
+
2.2µF
Figure 3b. Offset/Gain Circuits for Bipolar Input Ranges
LTC1609
R1IN
AGND1
R2IN
R3IN
CAP
REF
AGND2
1609 F03b
Table 1b. Analog Input Range Connections for Figure 3b
ANALOG INPUT
RANGE
CONNECT R1IN
VIA 200Ω TO
CONNECT R2IN
VIA 100Ω TO
±10V VIN AGND
±5V AGND VIN
±3.3V
VIN
VIN
CONNECT R3IN
TO
CAP
CAP
CAP
INPUT
IMPEDANCE
22.9kΩ
13.3kΩ
10.7kΩ
1609fa
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC1609.PDF ] | |
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