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LTC1412IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1412
12-Bit, 3Msps,
Sampling A/D Converter
The LTC
®
1412 is a 12-bit, 3Msps, sampling A/D con-
verter. This high performance device includes a high
dynamic range sample-and-hold and a precision refer-
ence. Operating from ±5V supplies it draws only 150mW.
The ±2.5V input range is optimized for low noise and low
distortion. Most high performance op amps also perform
best over this range, allowing direct coupling to the analog
inputs and eliminating the need for special translation
circuitry. Outstanding AC performance includes 72dB
S/(N + D) and 82dB SFDR at the Nyquist input frequency
of 1.5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 40MHz
bandwidth. The 60dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has a high speed 12-bit parallel output port. There
is no pipeline delay in the conversion results. A separate
convert start input and converter status signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors. A
digital output driver power supply pin allows direct con-
nection to 3V logic.
DESCRIPTION
U
FEATURES
TYPICAL APPLICATION
U
12-BIT ADC
12
5V
OPTIONAL
3V LOGIC
SUPPLY
10µF
AV
DD
DV
DD
OV
DD
OGND
1412 TA01
DGND
D11 (MSB)
D0 (LSB)
BUSY
S/H
BUFFER
LTC1412
4.0625V
2k
–5V
2.5V
REFERENCE
TIMING AND
LOGIC
OUTPUT
BUFFERS
•
•
•
CS
CONVST
AGNDV
SS
10µF
10µF
V
REF
COMP
A
IN
–
A
IN
+
Effective Bits and Signal-to-Noise + Distortion
vs Input Frequency
INPUT FREQUENCY (Hz)
2
EFFECTIVE NUMBER OF BITS
4
6
8
10
1k 100k 1M 10M
1412 G01
0
10k
12
S/(N + D) (dB)
62
74
56
68
■
Telecommunications
■
Digital Signal Processing
■
Mulitplexed Data Acquisition Systems
■
High Speed Data Acquisition
■
Spectrum Analysis
■
Imaging Systems
APPLICATIONS
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Sample Rate: 3Msps
■
72dB S/(N + D) and 82dB SFDR at Nyquist
■
±0.35LSB INL and ±0.25LSB DNL (Typ)
■
Power Dissipation: 150mW
■
External or Internal Reference Operation
■
True Differential Inputs Reject Common Mode Noise
■
40MHz Full Power Bandwidth Sampling
■
±2.5V Bipolar Input Range
■
No Pipeline Delay
■
28-Pin SSOP Package
2
LTC1412
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
AV
DD
= DV
DD
= V
DD
(Notes 1, 2)
Supply Voltage (V
DD
)................................................. 6V
Negative Supply Voltage (V
SS
) ................................ –6V
Total Supply Voltage (V
DD
to V
SS
) .......................... 12V
Analog Input Voltage
(Note 3) .........................(V
SS
– 0.3V) to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4) ..........(V
SS
– 0.3V) to 10V
Digital Output Voltage........(V
SS
– 0.3V) to (V
DD
+ 0.3V)
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1412C ............................................... 0°C to 70°C
LTC1412I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)..................300°C
ORDER PART
NUMBER
T
JMAX
= 110°C, θ
JA
= 95°C/ W
Consult factory for Military grade parts.
LTC1412CG
LTC1412IG
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 9) 4.75V ≤ V
DD
≤ 5.25V, –5.25V ≤ V
SS
≤ –4.75V ● ±2.5 V
I
IN
Analog Input Leakage Current CS = High ● ±1 µA
C
IN
Analog Input Capacitance Between Conversions 10 pF
During Conversions 4 pF
t
ACQ
Sample-and-Hold Acquisition Time ● 20 50 ns
t
AP
Sample-and-Hold Aperture Delay Time –0.5 ns
t
jitter
Sample-and-Hold Aperture Delay Time Jitter 1 ps
RMS
CMRR Analog Input Common Mode Rejection Ratio –2.5V < (A
IN
–
= A
IN
) < 2.5V 63 dB
With internal reference (Notes 5, 6)
CCHARA TERIST
ICS
CO
U
VERTER
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 12 Bits
Integral Linearity Error (Note 7) ● ±0.35 ±1 LSB
Differential Linearity Error ● ±0.25 ±1 LSB
Offset Error (Note 8) ±2 ±6 LSB
● ±8 LSB
Full-Scale Error ±15 LSB
Full-Scale Tempco I
OUT(REF)
= 0 ● ±15 ppm/°C
PUT
U
IA
A
U
LOG
(Note 5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A
IN
+
A
IN
–
V
REF
REFCOMP
AGND
D11 (MSB)
D10
D9
D8
D7
D6
D5
D4
DGND
AV
DD
DV
DD
V
SS
BUSY
CS
CONVST
OGND
OV
DD
DV
DD
DGND
D0
D1
D2
D3
3
LTC1412
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N + D) Signal-to-Noise Plus Distortion Ratio 100kHz Input Signal 72.5 dB
1.465MHz Input Signal 70 72 dB
THD Total Harmonic Distortion 100kHz Input Signal, First 5 Harmonics –90 dB
1.465MHz Input Signal, First 5 Harmonics –80 dB
SFDR Spurious Free Dynamic Range 1.465MHz Input Signal 82 dB
IMD Intermodulation Distortion f
IN1
= 29.37kHz, f
IN2
= 32.446kHz –84 dB
Full Power Bandwidth 40 MHz
Full Linear Bandwidth S/(N + D) ≥ 68dB 4 MHz
ACCURACY
IC
DY
U
W
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
Positive Supply Voltage (Note 10) 4.75 5.25 V
V
SS
Negative Supply Voltage (Note 10) –4.75 –5.25 V
I
DD
Positive Supply Current CS High ● 12 16 mA
I
SS
Negative Supply Current CS High ● 18 28 mA
P
D
Power Dissipation ● 150 220 mW
(Note 5)
I TER AL REFERE CE CHARACTERISTICS
U
UU
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Output Voltage I
OUT
= 0 2.480 2.500 2.520 V
V
REF
Output Tempco I
OUT
= 0 ±15 ppm/°C
V
REF
Line Regulation 4.75V ≤ V
DD
≤ 5.25V 0.01 LSB/V
–5.25V ≤ V
SS
≤ –4.75V 0.01 LSB/V
V
REF
Output Resistance 0.1mA ≤ I
OUT
≤ 0.1mA 2 kΩ
COMP Output Voltage I
OUT
= 0 4.06 V
POWER REQUIRE E TS
W
U
(Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 5.25V ● 2.4 V
V
IL
Low Level Input Voltage V
DD
= 4.75V ● 0.8 V
I
IN
Digital Input Current V
IN
= 0V to V
DD
● ±10 µA
C
IN
Digital Input Capacitance 1.4 pF
V
OH
High Level Output Voltage V
DD
= 4.75V, I
O
= –10µA 4.75 V
V
DD
= 4.75V, I
O
= –200µA ● 4.0 4.71 V
V
OL
Low Level Output Voltage V
DD
= 4.75V, I
O
= 160µA 0.05 V
V
DD
= 4.75V, I
O
= 1.6mA ● 0.10 0.4 V
I
OZ
Hi-Z Output Leakage D11 to D0 V
OUT
= 0V to V
DD
, CS High ● ±10 µA
C
OZ
Hi-Z Output Capacitance D11 to D0 CS High (Note 9) 7 pF
I
SOURCE
Output Source Current V
OUT
= 0V –10 mA
(Note 5)
DIGITAL I PUTS AND OUTPUTS
UU
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LTC1412IG#TRPBF

Mfr. #:
Buy LTC1412IG#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-B, 3Msps, Smpl A/D Conv
Lifecycle:
New from this manufacturer.
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