LTC2601/LTC2611/LTC2621
16-/14-/12-Bit Rail-to-Rail
DACs in 10-Lead DFN
FEATURES
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Smallest Pin-Compatible Single DACs:
LTC2601: 16 Bits
LTC2611: 14 Bits
LTC2621: 12 Bits
Guaranteed Monotonic Over Temperature
Wide 2.5V to 5.5V Supply Range
Low Power Operation: 300µA at 3V
Power Down to 1µA, Max
High Rail-to-Rail Output Drive (±15mA, Min)
Double-Buffered Data Latches
Asynchronous DAC Update Pin
Tiny (3mm
×
3mm) 10-Lead DFN Package
The LTC
®
2601/LTC2611/LTC2621 are single 16-, 14-
and 12-bit, 2.5V-to-5.5V rail-to-rail voltage output DACs
in a 10-lead DFN package. They have built-in high perfor-
mance output buffers and are guaranteed monotonic.
These parts establish new board-density benchmarks for
16- and 14-bit DACs and advance performance standards
for output drive, and load regulation in single-supply,
voltage-output multiples.
The parts use a simple SPI/MICROWIRE
TM
compatible
3-wire serial interface which can be operated at clock rates
up to 50MHz. Daisy-chain capability, hardware CLR and
asynchronous DAC update (LDAC) pins are included.
The LTC2601/LTC2611/LTC2621 incorporate a power-on
reset circuit. During power-up, the voltage outputs rise
less than 10mV above zero scale; and after power-up, they
stay at zero scale until a valid write and update take place.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
U.S. patent number 5396245.
APPLICATIO S
s
s
s
s
Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
BLOCK DIAGRA
2
SDI
6
REF
9
V
CC
3
SCK
INPUT
REGISTER
DAC
REGISTER
12-/14-/16-BIT DAC
7
DNL (LSB)
32-BIT
SHIFT
REGISTER
V
OUT
5
CS/LD
CONTROL
DECODE
LOGIC
SDO
LDAC
10
CLR
4
GND
8
1
2601 BD
U
Differential Nonlinearity (LTC2601)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2600 G02
W
U
V
CC
= 5V
V
REF
= 4.096V
2601f
1
LTC2601/LTC2611/LTC2621
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
SDO
SDI
SCK
CLR
CS/LD
1
2
3
4
5
11
10 LDAC
9 V
CC
8 GND
7 V
OUT
6 REF
Any Pin to GND ........................................... – 0.3V to 6V
Any Pin to V
CC
.............................................– 6V to 0.3V
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range
LTC2601C/LTC2611C/LTC2621C .......... 0°C to 70°C
LTC2601I/LTC2611I/LTC2621I .......... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
Lead Temperature (Soldering, 10 sec)................ 300°C
LTC2601CDD
LTC2601IDD
LTC2611CDD
LTC2611IDD
LTC2621CDD
LTC2621IDD
DD PART MARKING
LAGT
LBFQ
LBFS
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded,
unless otherwise noted.
SYMBOL
PARAMETER
Resolution
Monotonicity
DNL
INL
Integral Nonlinearity
Load Regulation
(Note 2)
(Note 2)
V
REF
= V
CC
= 5V, Midscale
I
OUT
= 0mA to 15mA Sourcing
I
OUT
= 0mA to 15mA Sinking
V
REF
= V
CC
= 2.5V, Midscale
I
OUT
= 0mA to 7.5mA Sourcing
I
OUT
= 0mA to 7.5mA Sinking
ZSE
V
OS
Zero-Scale Error
Offset Error
V
OS
Temperature
Coefficient
GE
Gain Error
Gain Temperature
Coefficient
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
q
q
q
q
q
q
q
q
q
q
LTC2621
TYP MAX
MIN
14
14
LTC2611
TYP MAX
MIN
16
16
LTC2601
TYP MAX
UNITS
Bits
Bits
DC Performance
12
12
±0.5
±0.8
±4
±3
0.10
0.15
0.2
0.3
1
±1.5
±5
±0.1
±2
±0.7
Differential Nonlinearity (Note 2)
±1
±16
0.5
0.5
1
1
9
±9
±13
0.45
0.60
0.9
1.2
1
±1.5
±5
±1
±64
2
2
4
4
9
±9
0.03 0.125
0.04 0.125
0.06
0.08
1
±1.5
±5
±0.03 ±0.7
±2
0.25
0.25
9
±9
LSB/mA
LSB/mA
LSB/mA
LSB/mA
mV
mV
µV/°C
%FSR
ppm/°C
Code = 0
(Note 5)
±0.05 ±0.7
±2
2
U
LSB
LSB
2601f
W
U
U
W W
W
LTC2601/LTC2611/LTC2621
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded,
unless otherwise noted.
SYMBOL
PSR
R
OUT
I
SC
PARAMETER
Power Supply Rejection
DC Output Impedance
Short-Circuit Output Current
CONDITIONS
V
CC
= 5V
±10%
V
CC
= 3V
±10%
q
ELECTRICAL CHARACTERISTICS
LTC2601/LTC2611/LTC2621
MIN
TYP
MAX
–80
–80
0.04
0.05
15
15
7.5
7.5
0
88
124
15
q
UNITS
dB
dB
V
REF
= V
CC
= 5V, Midscale; –15mA
≤
I
OUT
≤
15mA
q
V
REF
= V
CC
= 2.5V, Midscale; –7.5mA
≤
I
OUT
≤
7.5mA
q
V
CC
= 5.5V, V
REF
= 5.5V
Code: Zero Scale; Forcing Output to V
CC
Code: Full Scale; Forcing Output to GND
V
CC
= 2.5V, V
REF
= 2.5V
Code: Zero Scale; Forcing Output to V
CC
Code: Full Scale; Forcing Output to GND
q
q
q
q
0.15
0.15
60
60
50
50
V
CC
160
1
5.5
Ω
Ω
mA
mA
mA
mA
V
kΩ
pF
µA
V
mA
mA
µA
µA
V
V
35
39
20
27
Reference Input
Input Voltage Range
Resistance
Capacitance
I
REF
V
CC
I
CC
Reference Current, Power Down Mode DAC Powered Down
Positive Supply Voltage
Supply Current
For Specified Performance
V
CC
= 5V (Note 3)
V
CC
= 3V (Note 3)
DAC Powered Down (Note 3) V
CC
= 5V
DAC Powered Down (Note 3) V
CC
= 3V
V
CC
= 2.5V to 5.5V
V
CC
= 2.5V to 3.6V
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 5.5V
Load Current = –100µA
Load Current = +100µA
V
IN
= GND to V
CC
(Note 4)
Power Supply
q
q
q
q
q
q
Normal Mode
q
0.001
2.5
0.375
0.30
0.40
0.10
2.4
2.0
0.55
0.45
1
1
Digital I/O
V
IH
V
IL
V
OH
V
OL
I
LK
C
IN
Digital Input High Voltage
Digital Input Low Voltage
Digital Output High Voltage
Digital Output Low Voltage
Digital Input Leakage
Digital Input Capacitance
q
q
q
q
q
q
q
q
0.8
0.6
V
CC
– 0.4
0.4
±1
8
V
V
V
V
µA
pF
2601f
3
LTC2601/LTC2611/LTC2621
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. REF = 4.096V (V
CC
= 5V), REF = 2.048V (V
CC
= 2.5V), V
OUT
unloaded,
unless otherwise noted.
SYMBOL PARAMETER
AC Performance
t
S
Settling Time (Note 6)
±0.024%
(±1LSB at 12 Bits)
±0.006%
(±1LSB at 14 Bits)
±0.0015%
(±1LSB at 16 Bits)
±0.024%
(±1LSB at 12 Bits)
±0.006%
(±1LSB at 14 Bits)
±0.0015%
(±1LSB at 16 Bits)
7
7
9
2.7
4.8
0.80
1000
12
180
120
100
15
7
9
10
2.7
4.8
5.2
0.80
1000
12
180
120
100
15
µs
µs
µs
µs
µs
µs
V/µs
pF
nV • s
kHz
nV/√Hz
nV/√Hz
µV
P-P
CONDITIONS
LTC2621
MIN TYP MAX
LTC2611
MIN TYP MAX
LTC2601
MIN TYP MAX
UNITS
ELECTRICAL CHARACTERISTICS
Settling Time for 1LSB Step
(Note 7)
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse
Multiplying Bandwidth
e
n
Output Voltage Noise Density
Output Voltage Noise
2.7
0.80
1000
At Midscale Transition
At f = 1kHz
At f = 10kHz
0.1Hz to 10Hz
12
180
120
100
15
The
q
denotes specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (See Figure 1) (Note 4)
SYMBOL PARAMETER
V
CC
= 2.5V to 5.5V
t
1
SDI Valid to SCK Setup
t
2
SDI Valid to SCK Hold
t
3
SCK High Time
t
4
SCK Low Time
t
5
CS/LD Pulse Width
t
6
LSB SCK High to CS/LD High
t
7
CS/LD Low to SCK High
t
8
SDO Propagation Delay from SCK Falling Edge
CONDITIONS
q
q
q
q
q
q
q
TI I G CHARACTERISTICS
t
9
t
10
t
12
t
13
Note 1:
Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2:
Linearity and monotonicity are defined from code k
L
to code
2
N
– 1, where N is the resolution and k
L
is given by k
L
= 0.016(2
N
/V
REF
),
rounded to the nearest whole code. For V
REF
= 4.096V and N = 16, k
L
=
256 and linearity is defined from code 256 to code 65,535.
Note 3:
Digital inputs at 0V or V
CC
.
Note 4:
Guaranteed by design and not production tested.
4
UW
LTC2601/LTC2611/LTC2621
MIN
TYP
MAX
4
4
9
9
10
7
7
20
45
20
7
15
200
50
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
C
LOAD
= 10pF
V
CC
= 4.5V to 5.5V
V
CC
= 2.5V to 5.5V
q
q
q
q
q
q
CLR Pulse Width
CS/LD High to SCK Positive Edge
LDAC Pulse Width
CS/LD High to LDAC High or Low Transition
SCK Frequency
50% Duty Cycle
q
Note 5:
Inferred from measurement at code K
L
= 0.016(2
N
/V
REF
) and at
full scale.
Note 6:
V
CC
= 5V, V
REF
= 4.096V. DAC is stepped 1/4 scale to 3/4 scale
and 3/4 scale to 1/4 scale. Load is 2k in parallel with 200pF to GND.
Note 7:
V
CC
= 5V, V
REF
= 4.096V. DAC is stepped
±1LSB
between half
scale and half scale – 1. Load is 2k in parallel with 200pF to GND.
2601f
LTC2601/LTC2611/LTC2621
TYPICAL PERFOR A CE CHARACTERISTICS
LTC2601
Integral Nonlinearity (INL)
32
24
16
DNL (LSB)
INL (LSB)
8
0
–8
–16
–24
–32
0
16384
32768
CODE
49152
65535
2601 G01
V
CC
= 5V
V
REF
= 4.096V
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2600 G02
INL (LSB)
DNL vs Temperature
1.0
0.8
0.6
16
0.4
DNL (POS)
8
0
–8
–16
–0.6
–0.8
–1.0
–50
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
–24
–32
V
CC
= 5V
V
REF
= 4.096V
32
24
DNL (LSB)
0
–0.2
–0.4
DNL (NEG)
DNL (LSB)
INL (LSB)
0.2
Settling to
±1LSB
V
OUT
100µV/DIV
9.7µs
CS/LD
2V/DIV
V
CC
= 5V, V
REF
= 4.096V
1/4-SCALE TO 3/4-SCALE STEP
R
L
= 2k, C
L
= 200pF
AVERAGE OF 2048 EVENTS
U W
2601 G04
Differential Nonlinearity (DNL)
1.0
0.8
0.6
0.4
0.2
16
8
0
–8
–16
–24
V
CC
= 5V
V
REF
= 4.096V
32
24
INL vs Temperature
V
CC
= 5V
V
REF
= 4.096V
INL (POS)
INL (NEG)
–32
–50
–30
–10 10
30
50
TEMPERATURE (°C)
70
90
2601 G03
INL vs V
REF
V
CC
= 5.5V
1.5
1.0
INL (POS)
0.5
DNL vs V
REF
V
CC
= 5.5V
DNL (POS)
0
DNL (NEG)
–0.5
–1.0
–1.5
INL (NEG)
0
1
2
3
V
REF
(V)
4
5
2601 G05
0
1
2
3
V
REF
(V)
4
5
2601 G06
Settling of Full-Scale Step
V
OUT
100µV/DIV
12.3µs
CS/LD
2V/DIV
2µs/DIV
2601 G07
5µs/DIV
SETTLING TO
±1LSB
V
CC
= 5V, V
REF
= 4.096V
CODE 512 TO 65535 STEP
AVERAGE OF 2048 EVENTS
2601 G08
2601f
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
