LTC1606
16-Bit, 250ksps,
Single Supply ADC
FEATURES
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DESCRIPTIO
Sample Rate: 250ksps
Single 5V Supply
Bipolar Input Range:
±
10V
Signal-to-Noise Ratio: 90dB Typ
Power Dissipation: 75mW Typ
Guaranteed No Missing Codes
Integral Nonlinearity:
±2.0LSB
Max
Operates with Internal or External Reference
Internal Synchronized Clock
28-Pin SSOP and SO Packages
100ksps Version (LTC1605)
Improved 2nd Source to AD976A and ADS7805
Available in 28-Lead Plastic SSOP and SO Packages
The LTC
®
1606 is a 250ksps, sampling 16-bit A/D con-
verter that draws only 75mW (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 LTC1606’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 90dB signal-to-noise ratio offers an improvement of
3dB over competing devices, and the RMS transition noise
is reduced (0.65LSB vs 1LSB) relative to competitive
parts.
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.
All other trademarks are the property of their respective owners.
APPLICATIO S
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Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
BASIC CO FIGURATIO
5V
Low Power, 250kHz, 16-Bit Sampling ADC on 5V Supply
10µF
28
LTC1606
27
V
DIG
V
ANA
7.35k
6 TO 13
15 TO 22
16-BIT
SAMPLING ADC
9k
BUSY 26
1.64x
BUFFER
3 REF
4k
REFERENCE
AGND1
2
AGND2
5
DGND
14
1606 TA01
0.1µF
2.0
1.5
±10V
200Ω
INPUT
33.2k
1 V
IN
D15 TO D0
2.5k
4 CAP
INL (LSB)
16-BIT
OR 2 BYTE
PARALLEL
BUS
4.096V
10µF
2.5V
2.2µF
CONTROL
LOGIC AND
TIMING
CS 25
R/C 24
BYTE 23
DIGITAL
CONTROL
SIGNALS
U
Typical INL Curve
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384
32768
CODE
1606 G04
U
U
U
49152
65535
1606fa
1
LTC1606
ABSOLUTE
(Notes 1, 2)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
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
G PACKAGE
28-LEAD PLASTIC SSOP
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
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) ........ V
DGND
– 0.3V to 10V
Digital Output Voltage ........ V
DGND
– 0.3V to V
DIG
+ 0.3V
Power Dissipation .............................................. 500mW
Operating Ambient Temperature Range
LTC1606AC/LTC1606C ............................ 0°C to 70°C
LTC1606AI/LTC1606I ......................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1606ACG
LTC1606AIG
LTC1606CG
LTC1606IG
LTC1606ACSW
LTC1606AISW
LTC1606CSW
LTC1606ISW
T
JMAX
= 125°C,
θ
JA
= 95°C/W (G)
T
JMAX
= 125°C,
θ
JA
= 130°C/W (SW)
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
CO VERTER CHARACTERISTICS
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
(Note 7)
Ext. Reference = 2.5V (Note 8)
CONDITIONS
The
●
indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 5, 6)
MIN
●
●
●
●
LTC1606
TYP
MAX
MIN
16
16
LTC1606A
TYP
MAX
UNITS
Bits
Bits
16
15
0.65
±3
±10
±2
±7
0.65
±2
±10
±2
±5
±0.50
±0.25
±2
±8
±8
LSB
RMS
LSB
mV
ppm/°C
ppm/°C
%
ppm/°C
LSB
Ext. Reference = 2.5V (Notes 12, 13)
Ext. Reference = 2.5V
V
DD
= 5V
±5%
(Note 9)
●
±2
2
U
1606fa
W
U
U
W W
W
U
LTC1606
A ALOG I PUT
SYMBOL
V
IN
C
IN
R
IN
PARAMETER
Analog Input Range (Note 9)
Analog Input Capacitance
Analog Input Impedance
The
●
indicates specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
4.75V
≤
V
ANA
≤
5.25V, 4.75V
≤
V
DIG
≤
5.25V
●
DY A IC ACCURACY
SYMBOL
S/(N + D)
PARAMETER
Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal (Note 14)
10kHz Input Signal
20kHz, – 60dB Input Signal
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)
1kHz Input Signal, First 5 Harmonics
10kHz Input Signal, First 5 Harmonics
1kHz Input Signal
10kHz Input Signal
(Note 15)
THD
I TER AL REFERE CE 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
CONDITIONS
I
OUT
= 0
I
OUT
= 0
The
●
indicates specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
●
U
U
W U
U
U
LTC1606/LTC1606A
MIN
TYP
MAX
±10
10
10
UNITS
V
pF
kΩ
(Notes 5, 14)
CONDITIONS
LTC1606
MIN
TYP
MAX
83
90
90
30
– 102
– 94
– 102
– 94
275
40
1
150
150
LTC1606A
MIN
TYP
MAX
87
90
90
30
– 102
– 94
– 102
– 94
275
40
1
UNITS
dB
dB
dB
dB
dB
dB
dB
kHz
ns
µs
ns
– 87
– 89
Sufficient to Meet AC Specs Sufficient to Meet AC Specs
U
LTC1606/LTC1606A
TYP
MAX
2.500
±5
1
2.520
UNITS
V
ppm/°C
µA
2.470
2.30
●
2.50
4.096
2.70
100
V
µA
V
1606fa
3
LTC1606
DIGITAL I PUTS A D DIGITAL OUTPUTS
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
●
●
●
●
The
●
indicates specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
V
DD
= 5.25V
V
DD
= 4.75V
V
IN
= 0V to V
DD
●
●
●
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
Byte Delay
The
●
indicates specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
●
●
●
4
U
U
MIN
2.4
LTC1606/LTC1606A
TYP
MAX
0.8
±10
5
4.5
UNITS
V
V
µA
pF
V
V
V
4.0
0.05
0.10
0.4
±10
15
–10
10
V
µA
pF
mA
mA
UW
LTC1606/LTC1606A
MIN
TYP
MAX
250
2.5
1.5
40
2.5
65
2.5
100
40
●
●
UNITS
kHz
µs
µs
ns
µs
ns
µs
ns
ns
(Note 11)
(Note 9)
C
L
= 30pF
●
●
●
●
15
20
5
4
15
15
90
2
50
ns
ns
µs
ns
µs
(Notes 9, 10)
C
L
= 30pF
C
L
= 30pF (Notes 9, 10)
●
●
●
●
60
60
ns
ns
1606fa
LTC1606
The
●
indicates specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL
V
DD
I
DD
P
DIS
PARAMETER
Positive Supply Voltage
Positive Supply Current
Power Dissipation
CONDITIONS
(Notes 9, 10)
●
●
POWER REQUIREMENTS
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 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
= 250kHz, 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 – 0.5 LSB when
the output code flickers between 0000 0000 0000 0000 and 1111 1111
1111 1111.
U W
LTC1606/LTC1606A
MIN
TYP
MAX
4.75
15
75
5.25
20
100
UNITS
V
mA
mW
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 errors.
For best results, ensure that R/C returns high within 1µs 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.
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5
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