adc1204802 National Semiconductor Corporation, adc1204802 Datasheet - Page 8

• Manufacturer Part Number: adc1204802
• Description: 12-bit Plus Sign 216khz 8-channel Sampling Analog-to-digital Converter
• Manufacturer: National Semiconductor Corporation

www.national.com
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
CSWR
WRCS
WR
WRSETFalling
WRHOLDFalling
WRSETRising
WRHOLDRising
CSRD
RDCS
RDDATA
RDDATA
RDHOLD
RDRDY
WRRDY
STNDBY
STDONE
STDRDY
SYNC
Digital Timing Characteristics
The following specifications apply to the ADC12048, 13-bit data bus width, V
Notes on Specifications
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise specified.
Note 3: When the input voltage (V
30 mA. The 120 mA maximum package input current limits the number of pins that can safely exceed the power supplies with an input current of 30 mA to four.
Note 4: The maximum power dissipation must he derated at elevated temperatures and is dictated by T
junction to ambient thermal resistance), and T
or the number given in the Absolute Maximum Ratings, whichever is lower. For this device, T
in the V package, when board mounted, is 55˚C/W, and in the VF package, when board mounted, is 67.8˚C/W.
Note 5: Human body model, 100 pF discharged through 1.5 kΩ resistor.
Note 6: Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below, input voltage magnitude up to 0.3V above
V
conversion can occur if these diodes are forward biased by more than 50 mV. As an example, if V
accurate conversions.
= 50 pF on data I/O lines
Symbol
A
+ or 0.3V below GND will not damage the ADC12048. There are parasitic diodes that exist between the inputs and the power supply rails and errors in the A/D
Falling Edge of CS to Falling Edge of WR
Active Edge of WR to Rising Edge of CS
WR Pulse Width
Write Setup Time
Write Hold Time
Write Setup Time
Write Hold Time
Falling Edge of CS to Falling Edge of RD
Rising Edge of RD to Rising Edge of CS
Falling Edge of RD to Valid Data
Falling Edge of RD to Valid Data
Read Hold Time
Rising Edge of RD to Rising Edge of RDY
Active Edge of WR to Rising Edge of RDY
Active Edge of WR to Falling Edge of
STDBY
Active Edge of WR to Rising Edge of
STDBY
Active Edge of WR to Falling Edge of RDY WMODE = “0”. Writing the
Minimum SYNC Pulse Width
IN
) at any pin exceeds the power supply rails (V
Parameter
A
(ambient temperature). The maximum allowable power dissipation at any temperature is P
(Continued)
WMODE = “1”
WMODE = “1”
WMODE = “0”
WMODE = “0”
8-Bit Mode (BW Bit = “0”)
13-Bit Mode (BW Bit = “1”)
WMODE = “1”
WMODE = “0”. Writing the
Standby Command into the
Configuration Register
WMODE = “0”. Writing the
RESET Command into the
Configuration Register
RESET Command into the
Configuration Register
8
IN
Conditions
<
GND or V
Jmax
A
+ is 4.50 V
= 150˚C, and the typical thermal resistance (θ
A
IN
+ = V
>
(V
A
DC
D
+ or V
Jmax
+ = 5V, f
, full-scale input voltage must be ≤ 4.55 V
, (maximum junction temperature), θ
D
+)), the current at that pin should be limited to
(Note 10)
Typical
200
CLK
1.4
20
40
26
23
24
42
30
0
0
0
0
5
= 12 MHz, t
(Note 11)
Limits
230
2.5
Dmax
30
20
20
58
44
32
38
65
45
10
5
5
f
JA
= 3 ns and C
= (T
) of the ADC12048
Jmax
DC
JA
ms (max)
ns (max)
ns (max)
ns (max)
ns (max)
ns (max)
ns (max)
ns (max)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
ns (min)
(Limit)
(package
− T
to ensure
Units
ns
ns
ns
ns
A
)/θ
JA
L