LTC1668 LINER [Linear Technology], LTC1668 Datasheet - Page 4

• Manufacturer Part Number: LTC1668
• Description: 16-Bit, 50Msps DAC
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
LTC1668
TYPICAL PERFOR A CE CHARACTERISTICS
REFOUT (Pin 15): Internal Reference Voltage Output.
Nominal value is 2.5V. Requires a 0.1 F bypass capacitor
to AGND.
I
1.25mA for I
AGND (Pin 17): Analog Ground.
LADCOM (Pin 18): Attenuator Ladder Common. Normally
tied to GND.
I
scale output current occurs when all data bits are 0s.
I
current occurs when all data bits are 1s.
4
REFIN
OUT B
OUT A
U
(Pin 19): Complementary DAC Output Current. Full-
(Pin 16): Reference Input Current. Nominal value is
(Pin 20): DAC Output Current. Full-scale output
U
FS
= 10mA. I
–105
–15
–25
–35
–45
–55
–65
–75
–85
–95
–1
–2
–3
–5
–4
–5
1
5
4
3
2
0
0.05
U
Single Tone SFDR
Integral Nonlinearity
FS
16384
FREQUENCY (1.25MHz/DIV)
W
= I
DIGITAL INPUT CODE
REFIN
U
32768
6.3
f
f
AMPLITUDE = 0dBFS
SFDR = 86dBc
CLOCK
OUT
• 8.
= 1.007MHz
= 25Msps
49152
= –8.5dBm
1668 G03
1668 G01
65535
12.55
COMP1 (Pin 21): Current Source Control Amplifier Com-
pensation. Bypass to V
COMP2 (Pin 22): Internal Bypass Point. Bypass to V
with 0.1 F.
V
– 5V.
DGND (Pin 24): Digital Ground.
V
CLK (Pin 26): Clock Input. Data is latched and the output
is updated on positive edge of clock.
DB15 to DB0 (Pins 27, 28, 1 to 14): Digital Input Data Bits.
SS
DD
(Pin 25): Positive Supply Voltage. Nominal value is 5V.
(Pin 23): Negative Supply Voltage. Nominal value is
–100
–110
–0.5
–2.0
–1.0
–1.5
–10
–20
–30
–40
–50
–60
–70
–80
–90
2.0
1.5
1.0
0.5
0
3.2
0
2-Tone SFDR
Differential Nonlinearity
f
f
f
AMPLITUDE 1, 2
SFDR > 77dBc
CLOCK
OUT1
OUT2
4.028MHz
4.419MHz
= –6dBFS
= –14.5dBm
=
=
= 50Msps
16384
FREQUENCY (0.2MHz/DIV)
DIGITAL INPUT CODE
SS
32768
4.2
with 0.1 F.
49152
1668 G04
1668 G02
65535
5.2
SS