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HMCAD1050-40 Datasheet(PDF) 12 Page - Hittite Microwave Corporation

Part No. HMCAD1050-40
Description  Dual 13/12-Bit 20/40 MSPS A/D Converter
Download  14 Pages
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Maker  HITTITE [Hittite Microwave Corporation]
Homepage  http://www.hittite.com
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HMCAD1050-40 Datasheet(HTML) 12 Page - Hittite Microwave Corporation

 
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For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com
Application Support: apps@hittite.com
0
0 - 12
HMCAD1050-40
v01.0411
Dual 13/12-Bit 20/40 MSPS
a/D Converter
table 4: Data Format Description for 1vpp Full Scale range
Differential Input Voltage
(IPx - Inx)
Output data Dx_11:Dx_0
(DFrMt = 0)
(2’s Complement)
Out of Range
(Use Logical and Function
for &)
Output Data Dx_11:Dx_0
(DFrMt = 1)
(2’s Complement)
Out of Range
(Use Logical and Function
for &)
> 0.5v
0111 1111 1111
Dx_12 = 1 & Dx_11 = 1
0111 1111 1111
D_12 = 0 & D_11 = 1
0.5v
0111 1111 1111
0111 1111 1111
+0.24mv
0000 0000 0000
0000 0000 0000
-0.24mv
1111 1111 1111
1111 1111 1111
-0.5v
1000 0000 0000
1000 0000 0000
< -0.5v
1000 0000 0000
Dx_12 = 0 & Dx_11 = 0
1000 0000 0000
Dx_12 = 1 & Dx_11 = 0
Operational Modes
the operational modes are controlled with the PD_n
and sLP_n pins. If PD_n is set low, all other control
pins are overridden and the chip is set in Power Down
mode. In this mode all circuitry is completely turned off
and the internal clock is disabled. Hence, only leak-
age current contributes to the Power Down Dissipa-
tion. the startup time from this mode is longer than
for other idle modes as all references need to settle to
their final values before normal operation can resume.
the sLP_n bus can be used to power down each
channel independently, or to set the full chip in sleep
Mode. In this mode internal clocking is disabled, but
some low bandwidth circuitry is kept on to allow for a
short startup time. However, sleep Mode represents
a significant reduction in supply current, and it can be
used to save power even for short idle periods.
Startup Initialization
the HMCAD1050-40 must be reset prior to normal
operation. this is required every time the power
supply voltage has been switched off. A reset is per-
formed by applying Power Down mode. Wait until a
stable supply voltage has been reached, and pull the
PD_n pin for the duration of at least one clock cycle.
the input clock must be running continuously during
this Power Down period and until active operation
is reached. Alternatively the PD pin can be kept low
during power-up, and then be set high when the power
supply voltage is stable.
the input clock should be kept running in all idle
modes. However, even lower power dissipation is pos-
sible in Power Down mode if the input clock is stopped.
In this case it is important to start the input clock prior
to enabling active mode.


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