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AD669 DAC output issue

I am using AD669 in bipolar and we are facing the issues . 

following are the details of the circuit

1. /CS, /L1 and LDAC are all tied each other

2. To write data we are following timing diagram of figure 1b from datasheet

3. /CS, /L1 and LDAC (control signals) we are making initially  high then Low-> data -> control signals high -> control signal low

4. Negative output voltage we are getting as per data but positive voltages we are not getting

5. Some time negative output voltages also we are not getting

6. Schematic

Kindly help us to resolve this issue. Any care should be taken while power on and power off condition?