Datasheet
ADS7805
3
SBAS020D
www.ti.com
ELECTRICAL CHARACTERISTICS (Cont.)
T
A
= –25°C to +85°C, f
S
= 100kHz, V
DIG
= V
ANA
= +5V, using internal reference, unless otherwise specified.
ADS7805P, U ADS7805PB, UB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Parallel 16 Bits
Binary Two’s Complement
REFERENCE
Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 V
Int. Ref. Source Current (must use external buffer) 1 1 µA
Internal Reference Drift 8 8 ppm/°C
Ext. Ref. Voltage Range for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 V
External Reference Current Drain Ext. 2.5000V Ref 100 100 µA
DIGITAL INPUTS
Logic Levels
V
IL
–0.3 +0.8 –0.3 +0.8 V
V
IH
+2.0 V
D
+ 0.3V +2.0 V
D
+ 0.3V V
I
IL
±10 ±10 µA
I
IH
±10 ±10 µA
DIGITAL OUTPUTS
Data Format
Data Coding
V
OL
I
SINK
= 1.6mA +0.4 +0.4 V
V
OH
I
SOURCE
= 500µA+4 +4 V
Leakage Current High-Z State, V
OUT
= 0V to V
DIG
±5 ±5 µA
Output Capacitance High-Z State 15 15 pF
DIGITAL TIMING
Bus Access Time 83 83 ns
Bus Relinquish Time 83 83 ns
POWER SUPPLIES
Specified Performance
V
DIG
Must be ≤ V
ANA
+4.75 +5 +5.25 +4.75 +5 +5.25 V
V
ANA
+4.75 +5 +5.25 +4.75 +5 +5.25 V
I
DIG
0.3 0.3 mA
I
ANA
16 16 mA
Power Dissipation f
S
= 100kHz 100 100 mW
TEMPERATURE RANGE
Specified Performance –25 +85 –25 +85 °C
Operating Temperature
(8)
–40 +85 –40 +85 °C
Derated Performance –55 +125 –55 +125 °C
Storage –65 +150 –65 +150 °C
Thermal Resistance (
θ
JA
)
DIP-28 75 75 °C/W
SO-28 75 75 °C/W
NOTES: (1) LSB means Least Significant Bit. For the 16-bit, ±10V input ADS7805, one LSB is 305µV.
(2) Typical rms noise at worst case transitions and temperatures.
(3) As measured with fixed resistors, see Figure 4. Adjustable to zero with external potentiometer.
(4) Full-scale error is the worst case of –Full Scale or +Full Scale untrimmed deviation from ideal first and last code transitions, divided by the
transition voltage (not divided by the full-scale range) and includes the effect of offset error.
(5) All specifications in dB are referred to a full-scale ±10V input.
(6) Full-Power Bandwidth defined as Full-Scale input frequency at which Signal-to-(Noise + Distortion) degrades to 60dB, or 10 bits of accuracy.
(7) Recovers to specified performance after 2 • FS input overvoltage.
(8) Functionality test at –40°C.