MAX9969BDCCQ+TD Maxim Integrated, MAX9969BDCCQ+TD Datasheet - Page 26

• Manufacturer Part Number: MAX9969BDCCQ+TD
• Description: Interface - Specialized
• Manufacturer: Maxim Integrated
• Series: MAX9969r

Specifications of MAX9969BDCCQ+TD

• Product Type: ATE Driver/Comparator
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-100 EP
• Minimum Operating Temperature: 0 C

Dual, Low-Power, 1200Mbps ATE
Driver/Comparator with 35mA Load
Figure 3. Open-Collector Comparator Outputs
The active load consists of linearly programmable,
class AB source and sink current sources, a commuta-
tion buffer, and a diode bridge (see the Functional
Diagram). Analog control inputs LDH_ and LDL_ pro-
gram the sink and source currents, respectively, within
the 0 to 35mA range. Analog reference input COM_
sets the commutation buffer output voltage. The source
and sink naming convention is referenced to the DUT.
Current out of the MAX9969 constitutes sink current
and current into the MAX9969 constitutes source cur-
rent. The class AB loads of the MAX9969 offer substan-
tial efficiency improvement over conventional
active-load circuitry.
The programmed source (low) current loads the DUT
when V
current loads the DUT when V
High-speed differential input LDEN_ and 2 bits of the
control word (LDDIS and LLEAK) control the load
(Table 4). When the load is enabled, the internal source
and sink current sources connect to the diode bridge.
When the load is disabled, the internal current sources
shunt to ground and the top and bottom of the bridge
float (see the Functional Diagram). LLEAK places the
load in low-leakage mode, and overrides LDEN_. See the
26
OTHER CHANNEL
CHV_
DUT_
CLV_
FROM DUT_
______________________________________________________________________________________
DUT
CDIFF
_ > V
V
EE
8mA
8mA
COM
_. The programmed sink (high)
DUT
OPTIONAL
4 x 50Ω
_ < V
MAX9969
COM
Active Load
1Ω
1Ω
_.
CH_
NCH_
V
CL_
NCL_
CCO_
Table 4. Active Load Programming
Low-Leakage Mode, LLEAK section for more detailed
information.
In some tester configurations, the load enable is driven
with the complement of the driver high-impedance sig-
nal (RCV_), so disabling the driver enables the load
and vice versa. The LDDIS signal allows the load to be
disabled independent of the state of LDEN_ (Table 4).
The GS input allows a single level-setting DAC, such as
the MAX5631 or MAX5734, to program the MAX9969’s
active load, driver, comparator, and clamps. Although
all the DAC levels are typically offset by V
ation of the MAX9969’s ground-sense input nullifies this
offset with respect to the active-load current. Connect
GS to the ground reference used by the DAC. (V
V
V
To maintain an 8V range in the presence of GS variations,
DHV_, DLV_, DTV_, CPHV_, CPLV_, and COM_ ranges
are offset by GS. Adequate supply headroom must be
maintained in the presence of GS variations. Ensure:
Asserting LLEAK through the serial port or with RST
places the MAX9969 into a very low-leakage state (see
the Electrical Characteristics). With LLEAK asserted, the
comparators function at a reduced speed, and the dri-
ver, clamps, and active load are disabled. This mode is
convenient for making IDDQ and PMU measurements
without the need for an output disconnect relay. LLEAK
is programmed independently for each channel.
CONNECTIONS
GS
GS
EXTERNAL
) sets the sink current by -10mA/V.
) sets the source current by +10mA/V. (V
LDEN_
X
X
0
1
V
V
CC
EE
LDDIS
INTERNAL
REGISTER
CONTROL
X
0
0
1
Low-Leakage Mode, LLEAK
≤ -4.5V + Min(V
≥ 9.5V + Max(V
LLEAK
0
0
0
1
Normal operating mode,
Normal operating mode,
GS
GS
Low-leakage mode
Load disabled
load disabled
)
load enabled
)
MODE
GS
GS Input
, the oper-
LDDIS
LDH
LDL
_ -
_ -