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LTC1405CGN#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
1
LTC1405
1405fa
TYPICAL APPLICATION
U
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
12-Bit, 5Msps,
Sampling ADC
The LTC
®
1405 is a 5Msps, 12-bit sampling A/D converter
that draws only 115mW from either single 5V or dual ±5V
supplies. This easy-to-use device includes a high dynamic
range sample-and-hold, a precision reference and a PGA
input circuit.
The LTC1405 has a flexible input circuit that allows full-scale
input ranges of ±2.048V, ±1.024V and ±0.512V. The input
common mode range is rail-to-rail and a common mode
bias voltage is provided for single supply applications. The
input PGA has a digitally selectable 1x or 2x gain.
Maximum DC specs include ±1LSB INL and ±1LSB DNL
over temperature. Outstanding AC performance includes
71.3dB S/(N + D) and 85dB SFDR at the Nyquist input fre-
quency of 2.5MHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 100MHz
bandwidth. The 75dB common mode rejection allows users
to eliminate ground loops and common mode noise by
measuring signals differentially from the source. A sepa-
rate output logic supply allows direct connection to 3V
components.
■
5Msps Sample Rate
■
Low Power Dissipation: 115mW
■
Single 5V Supply or ±5V Supplies
■
71.3dB S/(N + D) and 85dB SFDR at Nyquist
■
100MHz Full-Power Bandwidth Sampling
■
Input PGA
■
Integral Nonlinearity Error <0.35LSB
■
Differential Nonlinearity <0.25LSB
■
±2.048V, ±1.024V and ±0.512V Bipolar Input Range
■
Out-of-Range Indicator
■
True Differential Inputs with 75dB CMRR
■
Pin-Compatible 10Msps Version (LTC1420)
■
28-Pin Narrow SSOP Package
■
Telecommunications
■
Digital Signal Processing
■
Multiplexed Data Acquisition Systems
■
High Speed Data Acquisition
■
Spectral Analysis
■
Imaging Systems
Typical INL Curve
CODE
0 1024 2048 3072 4096
INL (LSBs)
1405 TA02
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
DIGITAL CORRECTION
LOGIC
OUTPUT
BUFFERS
1405 TA01
MODE SELECT
S/H
5V
1µF
1µF
0V OR –5V
1µF
1µF
V
CM
GAIN
5V
1µF
5V
V
DD
(PIN 23)
V
DD
(PIN 7)
1µF
OV
DD
OGND
OPTIONAL 3V
LOGIC SUPPLY
OF
D11 (MSB)
D0 (LSB)
5MHz CLK
SENSE
V
REF
–A
IN
+
A
IN
V
SS
GND
(PIN 6)
GND
(PIN 24)
GND
(PIN 8)
2.048V
2.5V
REFERENCE
PIPELINED 12-BIT ADC
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
2
LTC1405
1405fa
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
0V
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 (V
DD
+ 0.3V)
Digital Output Voltage ........ (V
SS
– 0.3V) to (V
DD
+ 0.3V)
Power Dissipation.............................................. 500mW
Operating Temperature Range
LTC1405C ............................................... 0°C to 70°C
LTC1405I............................................ –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC1405CGN
LTC1405IGN
CO VERTER CHARACTERISTICS
U
Consult factory for parts specified with wider operating temperature ranges.
T
JMAX
= 125°C, θ
JA
= 80°C/W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
+A
IN
–A
IN
V
CM
SENSE
V
REF
GND
V
DD
GND
D11 (MSB)
D10
D9
D8
D7
D6
GAIN
OF
CLK
V
SS
GND
V
DD
OV
DD
OGND
D0
D1
D2
D3
D4
D5
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
With Internal 4.096V Reference. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)
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) ±5 12 LSB
● 16 LSB
Full-Scale Error ±10 30 LSB
Full-Scale Tempco I
OUT(REF)
= 0 ±15 ppm/°C
PUT
U
IA
A
U
LOG
The ● denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Input Range (Note 9) V
REF
= 4.096V (SENSE = 0V), GAIN = 5V ● ±2.048 V
+A
IN
– (–A
IN
)V
REF
= 4.096V (SENSE = 0V), GAIN = 0V ● ±1.024 V
V
REF
= 2.048V (SENSE = V
REF
), GAIN = 5V ● ±1.024 V
V
REF
= 2.048V (SENSE = V
REF
), GAIN = 0V ● ±0.512 V
External V
REF
(SENSE = 5V), GAIN = 5V ● ±V
REF
/2 V
External V
REF
(SENSE = 5V), GAIN = 0V ● ±V
REF
/4 V
I
IN
Analog Input Leakage Current ● ±10 µA
C
IN
Analog Input Capacitance Between Conversions 12 pF
During Conversions 6 pF
t
ACQ
Sample-and-Hold Acquisition Time 50 ns
3
LTC1405
1405fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage (Clock Pin) V
DD
= 5.25V, V
SS
= 0V ● 2.4 V
V
DD
= 5.25V, V
SS
= –5V ● 3.5 V
V
IL
Low Level Input Voltage (Clock Pin) V
DD
= 4.75V, V
SS
= 0V ● 0.8 V
V
DD
= 4.75V, V
SS
= –5V ● 1V
I TER AL REFERE CE CHARACTERISTICS
U
UU
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Output Voltage I
OUT
= 0 2.475 2.500 2.525 V
V
CM
Output Tempco I
OUT
= 0 ±15 ppm/°C
V
CM
Line Regulation 4.75V ≤ V
DD
≤ 5.25V 0.6 mV/V
–5.25V ≤ V
SS
≤ –4.75V 0.03 mV/V
V
CM
Output Resistance 0.1mA ≤ ⏐I
OUT
⏐ ≤ 0.1mA 8 Ω
V
REF
Output Voltage SENSE = GND, I
OUT
= 0 4.096 V
SENSE = V
REF
, I
OUT
= 0 2.048 V
SENSE = V
DD
Drive V
REF
with V
External Reference
V
REF
Output Tempco ±15 ppm/°C
T
A
= 25°C. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Specifications are guaranteed for both dual supply and single supply
operation. (Note 5)
The
● denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. V
DD
= 5V, V
SS
= –5V, f
SAMPLE
= 5MHz, V
REF
= 4.096V. +A
IN
= –0.1dBFS single ended input,
–A
IN
= 0V. (Note 6)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
S/(N + D) Signal-to-Noise Plus Distortion Ratio 1MHz Input Signal ● 69.0 71.6 dB
2.5MHz Input Signal
● 68.7 71.3 dB
THD Total Harmonic Distortion 1MHz Input Signal, First 5 Harmonics ● – 87 –78.5 dB
2.5MHz Input Signal, First 5 Harmonics
● – 83 –77.0 dB
SFDR Peak Harmonic or Spurious Noise 1MHz Input Signal ● – 89 –79.5 dB
2.5MHz Input Signal
● – 85 –78.0 dB
IMD Intermodulation Distortion f
IN1
= 29.37kHz, f
IN2
= 32.446kHz – 80 dB
Full-Power Bandwidth 100 MHz
Input Referred Noise ±2.048V Input Range 0.22 LSB
RMS
±1.024V Input Range, 2x Mode (SENSE = GAIN = 0V) 0.33 LSB
RMS
ACCURACY
IC
DY
U
W
A
PUT
U
IA
A
U
LOG
The ● denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. Specifications are guaranteed for both dual supply and single supply operation. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
AP
Sample-and-Hold Aperture Delay Time –250 ps
t
jitter
Sample-and-Hold Aperture Delay Time Jitter 0.6 ps
CMRR Analog Input Common Mode Rejection Ratio –2.048V < (–A
IN
= +A
IN
) < 2.048V 75 dB
DIGITAL I PUTS AND OUTPUTS
UU
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC1405CGN#TRPBF

Mfr. #:
Buy LTC1405CGN#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 12-B, 5Msps, Smpl ADC
Lifecycle:
New from this manufacturer.
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