Datasheet

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SBAS279D − AUGUST 2003 − REVISED JULY 2005
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4
ELECTRICAL CHARACTERISTICS: I-DAC (continued)
At T
A
= T
MIN
to T
MAX
(typical values are at T
A
= 25°C), +V
A
= +3V, +V
D
= +3V, Update Rate = 40MSPS, I
OUTFS
= 2mA, R
L
= 250Ω, C
L
≤ 10pF,
GSET = H, and internal reference, unless otherwise noted.
DAC2932
PARAMETER UNITSMAXTYPMINTEST CONDITIONS
Reference
Voltage, V
REF
+1.14 +1.22 +1.26 V
Tolerance ±30 mV
Voltage drift −40 ppm/°C
Output current 10 μA
Input resistance 1 MΩ
Input compliance range External V
REF
+1.22 V
Small-signal bandwidth 0.1 MHz
Digital Inputs
(6)
Logic coding Straight binary
Logic high voltage, V
IH
+2 +3 V
Logic low voltage, V
IL
0 +0.8 V
Logic high current ±1 μA
Logic low current ±1 μA
Input capacitance 5 pF
Power Supply
Analog supply voltage, +V
A
, +V
AV
2.7 3 3.3 V
Digital supply voltage, +V
D
, +V
DV
2.7 3 3.3 V
Analog supply current, I
VA
f
CLOCK
= 25MSPS, digital inputs at 0 4.7 mA
I
VA
f
CLOCK
= 40MSPS, f
OUT
= 2.2MHz 5.4 mA
I
VA
Standby mode 0.4 mA
Digital supply current, I
VD
f
CLOCK
= 25MSPS, digital inputs at 0 2 mA
l
VD
f
CLOCK
= 40MSPS, f
OUT
= 2.2MHz 4.3 mA
I
VD
Standby mode, clock off 0.02 mA
I
VD
Standby mode, CS = 0, f
CLOCK
= 25MSPS 1.3 mA
Power dissipation, PD
(8)
f
CLOCK
= 25MSPS, digital inputs at 0 20 25 mW
PD f
CLOCK
= 40MSPS, f
OUT
= 2.2MHz 29 mW
PD Standby mode, f
CLOCK
= 25MSPS 5.5 7 mW
PD Power-down mode, clock off, digital inputs at 0 25 μW
Thermal resistance
TQFP-48 θ
JA
97.5 °C/W
Q
θ
JC
20 °C/W
(1)
At output I
OUT1
, I
OUT2
, while driving a 250Ω load, transition from 000h to FFFh.
(2)
Measured at f
CLOCK
= 25MSPS and f
OUT
= 1.0MHz.
(3)
Differential, transformer (n = 4:1) coupled output, R
L
= 400Ω.
(4)
Differential outputs with a 250Ω load.
(5)
Nominal full−scale output current is I
OUTFS
+ 32 I
REF
+ 32
V
REF
R
SET
; with V
REF
+ 1.22V (typ) and R
SET
+ 19.6kW (1%)
(6)
Ensured by design and characterization; not production tested.
(7)
Gain error to remain ≤10% FSR over the full compliance range.
(8)
Combined power dissipation of I-DAC and V-DAC.