LTC1605
16-Bit, 100ksps,
Sampling ADC
FEATURES
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DESCRIPTION
The
LTC
®
1605
is a 100ksps, sampling 16-bit A/D converter
that draws only 55mW (typical) from a single 5V supply.
This easy-to-use device includes sample-and-hold, preci-
sion reference, switched capacitor successive approxima-
tion 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.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Single 5V Supply
Bipolar Input Range: ±10V
Power Dissipation: 55mW Typ
Guaranteed No Missing Codes
Sample Rate: 100ksps
Integral Nonlinearity: ±2.0LSB Max
Signal-to-Noise Ratio: 86dB Typ
Operates with Internal or External Reference
Internal Synchronized Clock
Improved 2nd Source to ADS7805 and AD976
28-Lead SSOP and SW Packages
APPLICATIONS
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Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
TYPICAL APPLICATION
Low Power, 100kHz, 16-Bit Sampling ADC on 5V Supply
5V
10 F
28
27
6 TO 13
15 TO 22
D15 TO D0
V
DIG
V
ANA
10V 200Ω
INPUT
33.2k
4 CAP
2.2 F
3 REF
2.2 F
AGND1
2
AGND2
5
DGND
14
1605 • TA01
Typical INL Curve
2.0
0.1 F
1.5
1.0
16-BIT
OR 2 BYTE
PARALLEL
BUS
INL (LSBs)
0.5
0
–0.5
–1.0
1 V
IN
20k
16-BIT
SAMPLING ADC
4k
10k
BUSY
26
BUFFER
4k
REFERENCE
CONTROL
LOGIC AND
TIMING
CS
25
R/C 24
BYTE 23
DIGITAL
CONTROL
SIGNALS
–1.5
–2.0
0
16384
32768
CODE
1605 • TA02
49152
65535
1605fd
For more information
www.linear.com/LTC1605
1
LTC1605
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
IN
1
AGND1 2
REF 3
CAP 4
AGND2 5
D15 (MSB) 6
D14 7
D13 8
D12 9
D11 10
D10 11
D9 12
D8 13
DGND 14
28 V
DIG
27 V
ANA
26
BUSY
25
CS
24 R/C
23 BYTE
22 D0
21 D1
20 D2
19 D3
18 D4
17 D5
16 D6
15 D7
SW PACKAGE
28-LEAD PLASTIC SO WIDE
V
ANA
..........................................................................7V
V
DIG
to V
ANA
............................................................0.3V
V
DIG
...........................................................................7V
Ground Voltage Difference
DGND, AGND1 and AGND2 ................................±0.3V
Analog Inputs (Note 3)
V
IN
.....................................................................±25V
CAP............................. V
ANA
+ 0.3V to AGND2 – 0.3V
REF ....................................Indefinite Short to AGND2
.......................................... Momentary Short to V
ANA
Digital Input Voltage (Note 4)..........DGND – 0.3V to 10V
Digital Output Voltage ........ V
DGND
– 0.3V to V
DIG
+ 0.3V
Power Dissipation .............................................. 500mW
Operating Ambient Temperature Range
LTC1605C ................................................ 0°C to 70°C
LTC1605I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
OBSOLETE PACKAGE
G PACKAGE
N PACKAGE
28-LEAD PLASTIC SSOP
28-LEAD PDIP
T
JMAX
= 125°C,
θ
JA
= 95°C/W (G)
T
JMAX
= 125°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 125°C,
θ
JA
= 130°C/W (SW)
EXPOSED PAD (PIN #) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC1605ACG#PBF
LTC1605AIG#PBF
LTC1605CG#PBF
LTC1605IG#PBF
LTC1605ACSW#PBF
LTC1605AISW#PBF
LTC1605CSW#PBF
LTC1605ISW#PBF
LTC1605CN#PBF
LTC1605IN#PBF
TAPE AND REEL
LTC1605ACG#TRPBF
LTC1605AIG#TRPBF
LTC1605CG#TRPBF
LTC1605IG#TRPBF
LTC1605ACSW#TRPBF
LTC1605AISW#TRPBF
LTC1605CSW#TRPBF
LTC1605ISW#TRPBF
LTC1605CN#TRPBF
LTC1605IN#TRPBF
PART MARKING
1605ACG
1605AIG
1605CG
1605IG
1605ACSW
1605AISW
1605CSW
1605ISW
1605CN
1605IN
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SSOP
28-Lead Plastic SO Wide
28-Lead Plastic SO Wide
28-Lead Plastic SO Wide
28-Lead Plastic SO Wide
OBSOLETE PACKAGE
28-Lead PDIP
28-Lead PDIP
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
1605fd
For more information
www.linear.com/LTC1605
LTC1605
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 5, 6)
PARAMETER
Resolution
No Missing Codes
Transition Noise
Integral Linearity Error
Bipolar Zero Error
Bipolar Zero Error Drift
Full-Scale Error Drift
Full-Scale Error
Full-Scale Error Drift
Power Supply Sensitivity
V
ANA
= V
DIG
= V
DD
Ext. Reference = 2.5V (Notes 12, 13)
Ext. Reference = 2.5V
V
DD
= 5V ±5% (Note 9)
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CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
LTC1605
CONDITIONS
l
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LTC1605A
MAX
MIN
16
16
TYP
MAX
UNITS
Bits
Bits
1.0
±3
±10
±2
±10
±2
±5
±0.50
±0.25
±2
±8
±8
LSB
LSB
mV
ppm/°C
ppm/°C
%
ppm/°C
LSB
MIN
16
15
TYP
1.0
(Note 7)
Ext. Reference = 2.5V (Note 8)
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±2
±7
±2
ANALOG INPUT
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
SYMBOL
V
IN
C
IN
R
IN
PARAMETER
Analog Input Range (Note 9)
Analog Input Capacitance
Analog Input Impedance
4.75V ≤ V
ANA
≤ 5.25V, 4.75V ≤ V
DIG
≤ 5.25V
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CONDITIONS
MIN
LTC1605/LTC1605A
TYP
±10
10
20
MAX
UNITS
V
pF
kΩ
DYNAMIC ACCURACY
(Notes 5, 14)
LTC1605/LTC1605A
SYMBOL
S/(N + D)
PARAMETER
Signal-to-(Noise + Distortion) Ratio
CONDITIONS
1kHz Input Signal (Note 14)
10kHz Input Signal
20kHz, –60dB Input Signal
THD
Total Harmonic Distortion
Peak Harmonic or Spurious Noise
Full-Power Bandwidth
Aperture Delay
Aperture Jitter
Transient Response
Overvoltage Recovery
Full-Scale Step (Note 9)
(Note 16)
150
1kHz Input Signal, First 5 Harmonics
10kHz Input Signal, First 5 Harmonics
1kHz Input Signal
10kHz Input Signal
(Note 15)
MIN
TYP
87.5
87
30
–102
–94
–102
–94
275
40
Sufficient to Meet AC Specs
2
µs
ns
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
kHz
ns
1605fd
For more information
www.linear.com/LTC1605
3
LTC1605
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
Internal Reference Source Current
External Reference Voltage for Specified Linearity
External Reference Current Drain
CAP Output Voltage
(Notes 9, 10)
Ext. Reference = 2.5V (Note 9)
I
OUT
= 0
l
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1605/LTC1605A
CONDITIONS
I
OUT
= 0
I
OUT
= 0
2.30
l
MIN
2.470
TYP
2.500
±5
1
2.50
2.50
MAX
2.520
UNITS
V
ppm/°C
µA
2.70
100
V
µA
V
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1605/LTC1605A
SYMBOL
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
C
OZ
I
SOURCE
I
SINK
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage D15 to D0
Hi-Z Output Capacitance D15 to D0
Output Source Current
Output Sink Current
V
DD
= 4.75V
V
DD
= 4.75V
V
OUT
= 0V to V
DD
,
CS
High
CS
High (Note 9)
V
OUT
= 0V
V
OUT
= V
DD
I
O
= –10µA
I
O
= –200µA
I
O
= 160µA
I
O
= 1.6mA
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DIGITAL INPUTS AND OUTPUTS
CONDITIONS
V
DD
= 5.25V
V
DD
= 4.75V
V
IN
= 0V to V
DD
MIN
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TYP
MAX
0.8
±10
UNITS
V
V
µA
pF
V
V
V
2.4
5
4.5
4.0
0.05
0.10
0.4
±10
15
–10
10
V
µA
pF
mA
mA
4
1605fd
For more information
www.linear.com/LTC1605
LTC1605
TIMING CHARACTERISTICS
SYMBOL
f
SAMPLE(MAX)
t
CONV
t
ACQ
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
Convert Pulse Width
Data Valid Delay After R/C↓
BUSY
Delay from R/C↓
BUSY
Low
BUSY
Delay After End of Conversion
Aperture Delay
Bus Relinquish Time
BUSY
Delay After Data Valid
Previous Data Valid After R/C↓
R/C to
CS
Setup Time
Time Between Conversions
Bus Access and Byte Delay
(Notes 9, 10)
(Notes 9, 10)
10
10
10
83
l
l
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1605/LTC1605A
CONDITIONS
l
l
l
MIN
100
TYP
MAX
8
2
UNITS
kHz
µs
µs
ns
µs
ns
µs
ns
ns
(Note 11)
(Note 9)
C
L
= 50pF
l
l
l
40
8
65
8
220
40
10
50
35
200
7.4
83
ns
ns
µs
ns
µs
ns
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC1605/LTC1605A
SYMBOL
V
DD
I
DD
P
DIS
PARAMETER
Positive Supply Voltage
Positive Supply Current
Power Dissipation
CONDITIONS
(Notes 9, 10)
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POWER REQUIREMENTS
MIN
4.75
TYP
11
55
MAX
5.25
16
80
UNITS
V
mA
mW
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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 V
ANA
= V
DIG
= V
DD
, they will be clamped by internal diodes. This product can
handle input currents of greater than 100mA below ground or above V
DD
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 V
DD
.
Note 5:
V
DD
= 5V, f
SAMPLE
= 100kHz, t
r
= t
f
= 5ns unless otherwise specified.
Note 6:
Linearity, offset and full-scale specifications apply for a V
IN
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 offset is the offset voltage measured from –0.5LSB when the
output code flickers between 0000 0000 0000 0000 and 1111 1111 1111 1111.
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 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.
1605fd
For more information
www.linear.com/LTC1605
5
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